Unflag `Gitlab/StrongMemoizeAttr` in singleton methods
What does this MR do and why?
Closes #385064 (closed). The background is well detailed in the issue.
Screenshots or screen recordings
I believe this MR is ok without them.
How to set up and validate locally
Cancel the cop implementation, run the test and you can see it fail.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.