Remove LOCAL_GIT_BRANCHES from settings

[stsewd]

Closes #4985

[stsewd]

This is only needed with branches, tags are fine.

[stsewd]

Python2 again :(

[codecov]

Codecov Report

Merging #4993 into master will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #4993      +/-   ##
==========================================
- Coverage   76.76%   76.74%   -0.02%     
==========================================
  Files         158      158              
  Lines        9953     9951       -2     
  Branches     1245     1244       -1     
==========================================
- Hits         7640     7637       -3     
  Misses       1980     1980              
- Partials      333      334       +1

Impacted Files	Coverage Δ
readthedocs/vcs_support/backends/git.py	81.13% <ø> (-0.86%)	⬇️

[stsewd]

Failure is only related to global coverage

[ericholscher]

Thanks for doing this. I probably should have figured out how to do it at the time, but this is a better solution than I had :)

[humitos]

Excellent! I like those comments in the code ;)

We could make those 3 steps a method or a function maybe if we think that we are going to use it normally.