Remove ancient EE::Model and EE::LegacyModel

changed the description

changed milestone to %17.1

added Engineering Productivity backend maintenanceremoval typemaintenance labels

added development guidelines docsimprovement documentation maintenancerefactor labels and removed maintenanceremoval label

	1 Warning
	5f97550a: Commits that change 30 or more lines across at least 3 files should describe these changes in the commit body. For more information, take a look at our Commit message guidelines.

	1 Message
	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.

Reviewer roulette

Category	Reviewer	Maintainer
backend	`@jon_jenkins` (UTC-5, 7 hours behind author)	`@shinya.maeda` (UTC+9, 7 hours ahead of author)
~"Backend Static Code Analysis"	Reviewer review is optional for ~"Backend Static Code Analysis"	`@ddieulivol` (UTC+2, same timezone as author)

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@jon_jenkins

Can you review this MR?

requested review from @jon_jenkins

requested review from @shinya.maeda and removed review request for @jon_jenkins

approved this merge request

added pipeline:mr-approved label

@shinya.maeda, thanks for approving this merge request.

This is the first time the merge request has been approved. To ensure we don't only run predictive pipelines, and we don't break master, a new pipeline will be started shortly.

Please wait for the pipeline to start before resolving this discussion and set auto-merge for the new pipeline. See merging a merge request for more details.

added pipelinetier-3 label and removed pipelinetier-1 label

LGTM

resolved all threads

enabled an automatic merge when the pipeline for abb9a399 succeeds

E2E Test Result Summary

allure-report-publisher generated test report!

e2e-test-on-gdk: test report for 5f97550a

expand test summary

+------------------------------------------------------------------+
|                          suites summary                          |
+-------------+--------+--------+---------+-------+-------+--------+
|             | passed | failed | skipped | flaky | total | result |
+-------------+--------+--------+---------+-------+-------+--------+
| Govern      | 64     | 0      | 1       | 41    | 65    | ✅     |
| Create      | 121    | 0      | 10      | 93    | 131   | ✅     |
| Plan        | 54     | 0      | 2       | 47    | 56    | ✅     |
| Package     | 19     | 0      | 12      | 19    | 31    | ✅     |
| Verify      | 30     | 0      | 2       | 29    | 32    | ✅     |
| Data Stores | 31     | 0      | 0       | 22    | 31    | ✅     |
| Analytics   | 1      | 0      | 1       | 0     | 2     | ✅     |
| Monitor     | 8      | 0      | 0       | 7     | 8     | ✅     |
| Manage      | 0      | 0      | 1       | 0     | 1     | ➖     |
| Release     | 5      | 0      | 0       | 5     | 5     | ✅     |
+-------------+--------+--------+---------+-------+-------+--------+
| Total       | 333    | 0      | 29      | 263   | 362   | ✅     |
+-------------+--------+--------+---------+-------+-------+--------+