[ci-visibility] Fix CI Visibility Spec Tests

[juan-fernandez]

Description

• Fix branch extraction in gitlab.
• Add stage and job name in azure pipelines.
• Add usersupplied.json as fixture (for user defined git metadata).
• Fix spec tests.

Context: DataDog/dd-trace-rb#1687

Checklist

• Added to the correct milestone.
• Tests provided or description of manual testing performed is included in the code or PR.
• Library documentation is updated.
• Corp site documentation is updated (link to the PR).

[brettlangdon]

@juan-fernandez can you add a changelog entry(ies) for this PR?

[juan-fernandez]

@juan-fernandez can you add a changelog entry(ies) for this PR?

sure, will do 👍

[juan-fernandez]

@juan-fernandez can you add a changelog entry(ies) for this PR?

sure, will do 👍

added it!

[juan-fernandez]

sanic tests are failing, but they seem to be flakes

[Kyle-Verhoog]

@juan-fernandez yeah sanic is failing unrelated, due to a new release. Working on a fix for it!

[juan-fernandez]

does it look good otherwise @brettlangdon ?

[codecov-commenter]

Codecov Report

Merging #2885 (0db7e0f) into master (4c89ecf) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2885   +/-   ##
=======================================
  Coverage   84.68%   84.68%           
=======================================
  Files         599      599           
  Lines       44315    44315           
=======================================
  Hits        37529    37529           
  Misses       6786     6786           

Impacted Files	Coverage Δ
ddtrace/ext/ci.py	62.40% <ø> (ø)

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[juan-fernandez]

sanic tests are passing now 👍

[juan-fernandez]

@Kyle-Verhoog maybe you can have a look too? The PR needs 2 approving reviews