Explicitly require SimpleDelegator for internal events cli

What does this MR do and why?

After updating my gdk, I just ran the internal events cli locally and hit an error:

% scripts/internal_events/cli.rb 
scripts/internal_events/cli.rb:128:in `<main>': uninitialized constant SimpleDelegator (NameError)

class GitlabPrompt < SimpleDelegator
                     ^^^^^^^^^^^^^^^

This MR fixes that error by require-ing the package needed for the Internal Events CLI to run.

MR acceptance checklist

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How to set up and validate locally

1. run scripts/internal_events/cli.rb from the gitlab directory

changed milestone to %17.3

added backend bugfunctional devopsmonitor groupanalytics instrumentation sectionanalytics typebug labels

assigned to @syasonik

added pipelinetier-1 label

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Category	Reviewer	Maintainer
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Generated by Danger

@nbelokolodov Could you review (and possibly merge?) this internal events cli fix?

requested review from @nbelokolodov

approved this merge request

added pipeline:mr-approved label

added pipelinetier-3 label and removed pipelinetier-1 label

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enabled automatic add to merge train when checks pass

E2E Test Result Summary

allure-report-publisher generated test report!

e2e-test-on-gdk: test report for 9de9c7eb

expand test summary

+------------------------------------------------------------------+
|                          suites summary                          |
+-------------+--------+--------+---------+-------+-------+--------+
|             | passed | failed | skipped | flaky | total | result |
+-------------+--------+--------+---------+-------+-------+--------+
| Plan        | 67     | 0      | 2       | 0     | 69    | ✅     |
| Create      | 127    | 0      | 12      | 0     | 139   | ✅     |
| Monitor     | 8      | 0      | 0       | 0     | 8     | ✅     |
| Data Stores | 30     | 0      | 1       | 0     | 31    | ✅     |
| Verify      | 43     | 0      | 2       | 0     | 45    | ✅     |
| Fulfillment | 1      | 0      | 0       | 0     | 1     | ✅     |
| Govern      | 69     | 0      | 0       | 0     | 69    | ✅     |
| Package     | 19     | 0      | 12      | 0     | 31    | ✅     |
| Analytics   | 2      | 0      | 0       | 0     | 2     | ✅     |
| Release     | 5      | 0      | 0       | 0     | 5     | ✅     |
| Secure      | 1      | 0      | 0       | 0     | 1     | ✅     |
| Manage      | 0      | 0      | 1       | 0     | 1     | ➖     |
+-------------+--------+--------+---------+-------+-------+--------+
| Total       | 372    | 0      | 30      | 0     | 402   | ✅     |
+-------------+--------+--------+---------+-------+-------+--------+

e2e-package-and-test: test report for 9de9c7eb

expand test summary

+---------------------------------------------------------------------+
|                           suites summary                            |
+----------------+--------+--------+---------+-------+-------+--------+
|                | passed | failed | skipped | flaky | total | result |
+----------------+--------+--------+---------+-------+-------+--------+
| Monitor        | 12     | 0      | 13      | 0     | 25    | ✅     |
| Create         | 270    | 0      | 34      | 10    | 304   | ✅     |
| GitLab Metrics | 2      | 0      | 1       | 0     | 3     | ✅     |
+----------------+--------+--------+---------+-------+-------+--------+
| Total          | 284    | 0      | 48      | 10    | 332   | ✅     |
+----------------+--------+--------+---------+-------+-------+--------+

started a merge train

merged

mentioned in incident gitlab-org/quality/engineering-productivity/master-broken-incidents#7661 (closed)

mentioned in incident gitlab-org/quality/engineering-productivity/master-broken-incidents#7663 (closed)

added workflowstaging-canary label

added workflowcanary label and removed workflowstaging-canary label