[GH-165] - Prevent double Base64 encoding of profile href + Github Actions updates

[soufianerafik]

Change Description: This PR fixes a bug in the b64_encode_href method of the Person model that caused double Base64 encoding of the href when navigating back in the browser. Changes I've made:

1. Updated b64_encode_href validator:
   • The method now checks if the href is already Base64 encoded before encoding it again, preventing the double encoding issue.

2. Github Actions:
   • Automated tests were failing due to outdated dependencies.
   • Switched to using pipx for installing Poetry and updated the Google dependencies.

Closes Github(s): GH-165

UW-Directory Pull Request checklist

• I have run poetry run tox
• I have selected a semver-guidance: label for this pull request (under labels,
  to the right of the screen)

[github-actions]

Download and run the latest build with:

./scripts/run-development-server.sh -i gcr.io/uwit-mci-iam/husky-directory.app:pull-request-166

[goulter]

Thanks @soufianerafik I'll run it locally to double check.

[goulter]

Please add a quick summary of the other changes you made here. You don't need to create new issues, but we may need to look back at some point and see when these were fixed.

Also, I remember the endpoint to PWS changed. Can you add that here? I need it :)

[jdiverp]

Looks okay to me..

[jprosser]

this looks good, thanks!

[goulter]

@soufianerafik and I clarified where the notes are and where to find another change I was looking for.