Release evidence migration test

What does this MR do and why?

Describe in detail what your merge request does and why.

Add release evidences migration spec

Closes #359061 (closed)

How to set up and validate locally

Numbered steps to set up and validate the change are strongly suggested.

$ cd qa
$ bundle exec rspec qa/specs/features/api/1_manage/migration/gitlab_migration_release_spec.rb

MR acceptance checklist

This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.

• I have evaluated the MR acceptance checklist for this MR.