[27.1 backport] gha: check-pr-branch: fix branch check regression #48195
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This check was updated in f460110, but introduced some bugs;
(
,)
) were escaped (they previously were used bysed
, which requires different escaping), so no value was captured.$target_branch
env-var, so was comparing against the$GITHUB_BASE_REF
(which is the branch name before stripping minor versions).(cherry picked from commit e0b98a3)