Update use flag

[timarney]

Summary | Résumé

• Updates usage of useFlag per Add use load flag + isLoading status #1512
• Updates components + test that utilize useFlag

Test instructions | Instructions pour tester la modification

• Test login page
• Ensure the Form is working properly

Unresolved questions / Out of scope | Questions non résolues ou hors sujet

• Opted not to utilize isLoading for the login page --- as the UI being conditional without a loader seems fine

Pull Request Checklist

Please complete the following items in the checklist before you request a review:

• Have you completely tested the functionality of change introduced in this PR? Is the PR solving the problem it's meant to solve within the scope of the related issue?
• The PR does not introduce any new issues such as failed tests, console warnings or new bugs.
• If this PR adds a package have you ensured its licensed correctly and does not add additional security issues?
• Is the code clean, readable and maintainable? Is it easy to understand and comprehend.
• Does your code have adequate comprehensible comments? Do new functions have docstrings?
• Have you modified the change log and updated any relevant documentation?
• Is there adequate test coverage? Both unit tests and end-to-end tests where applicable?
• If your PR is touching any UI is it accessible? Have you tested it with a screen reader? Have you tested it with automated testing tools such as axe?

[github-actions]

Storybooks Link For Branch
https://cds-snc.github.io/platform-forms-client/refs/pull/1516/merge

[bryan-robitaille]

👍