Hide GoogleLoginButton if no Google OAuth key provided.

[Ryszard-Trojnacki]

Description

I have make a simple change to webapp, that hides GoogleLoginButton if key in environment variable VITE_GOOGLE_OAUTH_CLIENT_ID is not provided (empty).

This change makes sense for self-hosting installation without Google OAuth.

Warning: Default value of VITE_GOOGLE_OAUTH_CLIENT_ID = ? is not interpreded as empty key. Question mark (?) needs to be removed.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

How Has This Been Tested?

Please describe the tests that you ran to verify your changes. Provide instructions so we can reproduce. Please also list any relevant details for your test configuration

• Passes test case
• UI components visually reviewed on desktop view
• UI components visually reviewed on mobile view
• Other (please explain)

Installed on self-hosted server with VITE_GOOGLE_OAUTH_CLIENT_ID empty and non empty values.

Checklist:

• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• The precommit and linting ran successfully
• I have added or updated language tags for text that's part of the UI
• I have added "MISSING" for all new language tags to languages I don't speak
• I have added the GNU General Public License to all new files