exp push: Handle rev arg as list.

[daavoo]

Closes #9471

[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.04 🎉

Comparison is base (e6e3912) 91.56% compared to head (b4be53f) 91.60%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #9472      +/-   ##
==========================================
+ Coverage   91.56%   91.60%   +0.04%     
==========================================
  Files         489      489              
  Lines       38231    38264      +33     
  Branches     3475     5489    +2014     
==========================================
+ Hits        35005    35053      +48     
+ Misses       2648     2642       -6     
+ Partials      578      569       -9     

Impacted Files	Coverage Δ
dvc/repo/experiments/push.py	81.55% <100.00%> (+0.36%)	⬆️
tests/func/experiments/test_remote.py	100.00% <100.00%> (ø)

... and 28 files with indirect coverage changes

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