Add branches to push subcommand

[SandrineP]

Add <branch> and --branches flag to push subcommand.

[codecov]

Codecov Report

❌ Patch coverage is 63.63636% with 12 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.94%. Comparing base (c8109c6) to head (16c961f).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
src/subcommand/push_subcommand.cpp	67.74%	10 Missing ⚠️
src/utils/progress.cpp	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #126      +/-   ##
==========================================
- Coverage   88.23%   86.94%   -1.30%     
==========================================
  Files          60       60              
  Lines        2619     2642      +23     
  Branches      309      313       +4     
==========================================
- Hits         2311     2297      -14     
- Misses        308      345      +37     

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