use the same ref to check branch existance and merge-base calculation #601
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What this PR does / why we need it:
#511 added the BranchExists check, but it used the value of --target-branch while MergeBase used the compound value of --remote/--target-branch
this PR changes BranchExists to use the same value as MergeBase.
Which issue this PR fixes (optional, in
fixes #<issue number>(, fixes #<issue_number>, ...)
format, will close that issue when PR gets merged): fixes #577 #580Special notes for your reviewer: