release-2.1: teamcity-trigger: plumb TC_BUILD_BRANCH env var into builder #30133
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Backport 1/1 commits from #30128.
/cc @cockroachdb/release
c0bc52b added a dependency on the TC_BUILD_BRANCH env var to the
teamcity-trigger binary, but the wrapping shell script was not
propagating the variable into the builder's env.
Release note: None