chore: Add Codecov token parameter

[filzrev]

After PR(#10456) is merged to main.

Following error occurred on CI job on main branch.

error - 2024-12-14 13:42:58,342 -- Upload failed: {"message":"Token required because branch is protected"}
==> Failed to upload coverage
    Exiting...

For protected branch. Tokenless Uploads for Public Repositories seems not works.
So I've added parameter that is used before.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.40%. Comparing base (fe673ec) to head (f796f72).
Report is 494 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10459      +/-   ##
==========================================
+ Coverage   74.31%   79.40%   +5.08%     
==========================================
  Files         536      547      +11     
  Lines       23189    23623     +434     
  Branches     4056     4061       +5     
==========================================
+ Hits        17234    18758    +1524     
+ Misses       4853     3695    -1158     
- Partials     1102     1170      +68     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[filzrev]

Note: ci environment seems be removed at this commit

So it need to set CODECOV_TOKEN as repository secrets to work this settings. (or revert to use ci environment secrets)

[filzrev]

I've added .github/codecov.yml file for Codecov.

What's changed from default Codecov setting

1. coverage:: Set to report coverage information only.
2. comment: false: Suppress PR comment from CodeCov. (To suppress GitHub notifications)
3. github_checks:: Suppress GitHub annotations. (Because It's deprecated to use by Codecov)

TODO
After this PR is merged to main branch.
Following checks will be displayed on PR's GitHub Checks. and it can confirm code coverage information from these links.

• codecov/patch
• codecov/project

If these checks are not displayed.
It might to re-install Codecov GitHub apps to docfx repository.

[filzrev]

Change fail_ci_if_error parameter to false.

It's required because forked repository's main branch CI is failed when CODECOV_TOKEN token is not set.
And when custom CODECOV_TOKEN token is explicitly set on forked respository.
Tokenless Uploads for dotnet/docfx is failed on Pull Request CI.

So don't use CODECOV_TOKEN secret on forked respository. and ignore main branch's CI error on forked repository.