Fix Gitlab/StrongMemoizeAttr offenses

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What does this MR do and why?

It fixes some of the Gitlab/StrongMemoizeAttr offenses.

Changelog: other

MR acceptance checklist

Please evaluate this MR against the MR acceptance checklist. It helps you analyze changes to reduce risks in quality, performance, reliability, security, and maintainability.

Screenshots or screen recordings

Removing the following files from exclusion list:

    - 'app/components/pajamas/avatar_component.rb'
    - 'app/controllers/application_controller.rb'
    - 'app/controllers/concerns/boards_actions.rb'
    - 'app/controllers/concerns/creates_commit.rb'
    - 'app/controllers/concerns/find_snippet.rb'
    - 'app/controllers/concerns/impersonation.rb'
    - 'app/controllers/concerns/issuable_actions.rb'
    - 'app/controllers/concerns/issuable_collections.rb'
    - 'app/controllers/concerns/known_sign_in.rb'
    - 'app/controllers/ide_controller.rb'
    - 'app/controllers/import/github_controller.rb'
    - 'app/controllers/invites_controller.rb'

and running bundle exec rubocop --only Gitlab/StrongMemoizeAttr on master branch and the current branch yields the following results respectively:

Before	After
39399 files inspected,	39399 files inspected
14 offenses detected,	no offenses detected
14 offenses autocorrectable

How to set up and validate locally

Run bundle exec rubocop --only Gitlab/StrongMemoizeAttr from the terminal to validate the changes locally.