Remove unused feature flags from custom abilities

What does this MR do and why?

• This MR cleans up the custom ability definitions, since the feature flags specified in them no longer exist.
• Updates the custom roles doc to add a step on how new custom abilities can be added with a feature flag.

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

assigned to @hmehra

added pipelinetier-1 label

added backend development guidelines docsimprovement documentation maintenancerefactor typemaintenance labels

	1 Warning
	This merge request does not refer to an existing milestone.

	2 Messages
	This MR contains docs in the /doc/development directory, but any Maintainer (other than the author) can merge. You do not need tech writer review.
	This merge request adds or changes documentation files. A review from the Technical Writing team before you merge is recommended. Reviews can happen after you merge.

Documentation review

The following files require a review from a technical writer:

• doc/user/custom_roles/abilities.md (Link to current live version)

The review does not need to block merging this merge request. See the:

• Metadata for the *.md files that you've changed. The first few lines of each *.md file identify the stage and group most closely associated with your docs change.
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Reviewer roulette

Category	Reviewer	Maintainer
backend	@jon_jenkins (UTC-6, 17 hours behind author)	@mhamda (UTC+1, 10 hours behind author)

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Generated by Danger

mentioned in merge request !175793 (merged)

marked this merge request as ready

changed the description

Hey @imand3r would you do the initial backend review please?

requested review from @imand3r

approved this merge request

requested review from @jarka

added pipeline:mr-approved label

added pipelinetier-2 label and removed pipelinetier-1 label

Before you set this MR to auto-merge

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• You are the last maintainer of this merge request
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E2E Test Result Summary

allure-report-publisher generated test report!

e2e-test-on-gdk: test report for 1ae2476b

expand test summary

+------------------------------------------------------------------+
|                          suites summary                          |
+-------------+--------+--------+---------+-------+-------+--------+
|             | passed | failed | skipped | flaky | total | result |
+-------------+--------+--------+---------+-------+-------+--------+
| Data Stores | 33     | 0      | 10      | 0     | 43    | ✅     |
| Govern      | 80     | 0      | 12      | 0     | 92    | ✅     |
| Create      | 135    | 0      | 20      | 0     | 155   | ✅     |
| Growth      | 0      | 0      | 2       | 0     | 2     | ➖     |
| Plan        | 82     | 0      | 8       | 0     | 90    | ✅     |
| Manage      | 1      | 0      | 9       | 0     | 10    | ✅     |
| Verify      | 50     | 0      | 16      | 0     | 66    | ✅     |
| Secure      | 4      | 0      | 3       | 0     | 7     | ✅     |
| Release     | 5      | 0      | 1       | 0     | 6     | ✅     |
| Fulfillment | 2      | 0      | 7       | 0     | 9     | ✅     |
| Package     | 25     | 0      | 13      | 0     | 38    | ✅     |
| Configure   | 0      | 0      | 3       | 0     | 3     | ➖     |
| Monitor     | 8      | 0      | 12      | 0     | 20    | ✅     |
| Ai-powered  | 0      | 0      | 2       | 0     | 2     | ➖     |
| Analytics   | 2      | 0      | 0       | 0     | 2     | ✅     |
| ModelOps    | 0      | 0      | 1       | 0     | 1     | ➖     |
+-------------+--------+--------+---------+-------+-------+--------+
| Total       | 427    | 0      | 119     | 0     | 546   | ✅     |
+-------------+--------+--------+---------+-------+-------+--------+

e2e-test-on-cng: test report for 1ae2476b

expand test summary

+------------------------------------------------------------------+
|                          suites summary                          |
+-------------+--------+--------+---------+-------+-------+--------+
|             | passed | failed | skipped | flaky | total | result |
+-------------+--------+--------+---------+-------+-------+--------+
| Plan        | 86     | 0      | 8       | 0     | 94    | ✅     |
| Package     | 30     | 0      | 14      | 0     | 44    | ✅     |
| Verify      | 51     | 0      | 15      | 0     | 66    | ✅     |
| Create      | 140    | 0      | 19      | 1     | 159   | ✅     |
| Govern      | 84     | 0      | 10      | 0     | 94    | ✅     |
| Release     | 5      | 0      | 1       | 0     | 6     | ✅     |
| Monitor     | 8      | 0      | 12      | 0     | 20    | ✅     |
| Fulfillment | 2      | 0      | 7       | 0     | 9     | ✅     |
| Data Stores | 33     | 0      | 10      | 0     | 43    | ✅     |
| Manage      | 1      | 0      | 9       | 0     | 10    | ✅     |
| Ai-powered  | 0      | 0      | 2       | 0     | 2     | ➖     |
| Configure   | 0      | 0      | 3       | 0     | 3     | ➖     |
| Secure      | 2      | 0      | 5       | 0     | 7     | ✅     |
| Analytics   | 2      | 0      | 0       | 0     | 2     | ✅     |
| ModelOps    | 0      | 0      | 1       | 0     | 1     | ➖     |
| Growth      | 0      | 0      | 2       | 0     | 2     | ➖     |
+-------------+--------+--------+---------+-------+-------+--------+
| Total       | 444    | 0      | 118     | 1     | 562   | ✅     |
+-------------+--------+--------+---------+-------+-------+--------+

mentioned in issue gitlab-com/www-gitlab-com#13970 (closed)

approved this merge request

resolved all threads

added pipelinetier-3 pipeline:run-e2e-omnibus-once labels and removed pipelinetier-2 label

Thanks @hmehra , setting auto-merge

enabled automatic add to merge train when checks pass

started a merge train

merged

mentioned in commit 42b432e1

mentioned in incident gitlab-org/quality/engineering-productivity/master-broken-incidents#9839 (closed)

added workflowstaging-canary label

added workflowcanary label and removed workflowstaging-canary label

added workflowproduction label and removed workflowcanary label

added workflowstaging label and removed workflowproduction label

changed milestone to %17.8

added workflowpost-deploy-db-staging label and removed workflowstaging label

added workflowpost-deploy-db-production label and removed workflowpost-deploy-db-staging label

added releasedcandidate label

added releasedpublished label and removed releasedcandidate label