exp: use exp git remote for studio repo url

[dberenbaum]

Simplifies setting studio repo url per the suggestion here.

If DVC_EXP_GIT_REMOTE env var or dvc config exp.git_remote is set, the url for that remote will be set for sending updates to Studio and override DVC_STUDIO_REPO_URL/studio.repo_url (these can be deprecated and dropped in the future).

Closes #10137

• Docs PR: use exp git remote to set studio repo url dvc.org#5178
• Look whether DVCLive changes are needed: use dvc_exp_git_remote to set studio repo url dvclive#799

[codecov]

Codecov Report

Attention: Patch coverage is 90.90909% with 2 lines in your changes are missing coverage. Please review.

Project coverage is 90.67%. Comparing base (603da1c) to head (bd0c3cb).

Files	Patch %	Lines
dvc/utils/studio.py	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #10345      +/-   ##
==========================================
- Coverage   90.67%   90.67%   -0.01%     
==========================================
  Files         500      500              
  Lines       38679    38700      +21     
  Branches     5591     5596       +5     
==========================================
+ Hits        35073    35092      +19     
- Misses       2963     2965       +2     
  Partials      643      643              

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[skshetry]

Rest looks good to me.