✂️✂️✂️ Remove API v0 support ✂️✂️✂️

[fdocr]

What type of PR is this? (check all applicable)

• Refactor
• Optimization

Description

After the transition period and now that the API V1 docs are ready we're in shape to get rid of the old V0 API endpoints and stick with the new major version going forward.

This PR gets rid of the concerns extraction of logic (used to avoid repeating the code on shared controllers) so it will all be easier to find/understand in the codebase.

Related Tickets & Documents

N/A

QA Instructions, Screenshots, Recordings

• Check out the code locally and try out some API endpoints
• Check out the specs in place and ensure they're ✅

UI accessibility concerns?

None - backend change

Added/updated tests?

• Yes

[Forem core team only] How will this change be communicated?

Will this PR introduce a change that impacts Forem members or creators, the
development process, or any of our internal teams? If so, please note how you
will share this change with the people who need to know about it.

• I've updated the Developer Docs or
  Storybook (for Crayons components)
• This PR changes the Forem platform and our documentation needs to be
  updated. I have filled out the
  Changes Requested
  issue template so Community Success can help update the Admin Docs
  appropriately.
• I've updated the README or added inline documentation
• I've added an entry to
  CHANGELOG.md
• I will share this change in a Changelog
  or in a forem.dev post
• I will share this change internally with the appropriate teams
• I'm not sure how best to communicate this change and need help
• This change does not need to be communicated, and this is why not: please
  replace this line with details on why this change doesn't need to be
  shared

[optional] Are there any post deployment tasks we need to perform?

This is a sensitive change. I strongly recommend some manual monitoring over the next hour or two after this is merged to ensure no edge case scenarios are causing an elevated amount of user facing errors

[optional] What gif best describes this PR or how it makes you feel?

[github-actions]

Uffizzi Preview Environment deployment-13456

☁️ https://app.uffizzi.com/github.com/forem/forem/pull/19062

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[codecov]

Codecov Report

Base: 80.17% // Head: 79.96% // Decreases project coverage by -0.21% ⚠️

Coverage data is based on head (1fbde09) compared to base (605ebbf).
Patch coverage: 98.21% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #19062      +/-   ##
==========================================
- Coverage   80.17%   79.96%   -0.21%     
==========================================
  Files        1136     1102      -34     
  Lines       25012    24835     -177     
  Branches     1758     1769      +11     
==========================================
- Hits        20054    19860     -194     
- Misses       4709     4723      +14     
- Partials      249      252       +3     

Flag	Coverage Δ
javascript	46.35% <ø> (+0.05%)	⬆️
ruby	93.78% <98.21%> (-0.08%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
app/controllers/application_controller.rb	95.38% <ø> (ø)
app/controllers/api/v1/users_controller.rb	93.33% <92.30%> (-6.67%)	⬇️
app/controllers/api/v1/articles_controller.rb	95.89% <95.45%> (-4.11%)	⬇️
app/controllers/api/v1/analytics_controller.rb	97.67% <97.14%> (-2.33%)	⬇️
app/controllers/api/v1/admin/users_controller.rb	100.00% <100.00%> (ø)
app/controllers/api/v1/comments_controller.rb	100.00% <100.00%> (ø)
app/controllers/api/v1/feature_flags_controller.rb	100.00% <100.00%> (ø)
app/controllers/api/v1/followers_controller.rb	100.00% <100.00%> (ø)
app/controllers/api/v1/follows_controller.rb	100.00% <100.00%> (ø)
app/controllers/api/v1/health_checks_controller.rb	100.00% <100.00%> (ø)
... and 10 more

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[fdocr]

This is what you'll find in all v1 controllers: Removing the include of the concern and inclusion of the concern code itself in the controller

[mirie]

I will close this for now. When we decide how to move forward, we can open with a new PR