Fix RSpec/UselessDynamicDefinition for merge_request_spec.rb

What does this MR do and why?

Contributes to #406761 (closed)

Fixes an offense for Rspec/UselessDynamicDefinition in merge_request_spec.rb. No user-facing changes.

MR acceptance checklist

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changed milestone to %16.0

added backend groupsource code maintenancerefactor labels

assigned to @vyaklushin

added typemaintenance label

added devopscreate sectiondev labels

mentioned in issue #406761 (closed)

Reviewer roulette

Changes that require review have been detected!

Please refer to the table below for assigning reviewers and maintainers suggested by Danger in the specified category:

Category	Reviewer	Maintainer
backend	Ravi Kumar (@rkumar555) (UTC+2, same timezone as @vyaklushin)	Tetiana Chupryna (@brytannia) (UTC+2, same timezone as @vyaklushin)

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Generated by Danger

Hi @brytannia! Can you please review this minor fix?

requested review from @brytannia

approved this merge request

@brytannia, thanks for approving this merge request.

This is the first time the merge request is approved. To ensure full test coverage, a new pipeline will be started shortly.

For more info, please refer to the following links:

• rspec predictive jobs
• jest predictive jobs
• merging a merge request.

added pipeline:mr-approved label

resolved all threads

enabled an automatic merge when the pipeline for 7aad1b00 succeeds

merged

mentioned in commit b5c4f91d

added workflowstaging-canary label

added workflowcanary label and removed workflowstaging-canary label

added workflowstaging label and removed workflowcanary label