[8.5.0] Improve action key computation for command lines with Labels
#27259
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This avoids rerunning an action when the main repo mapping changes in unrelated ways, for example because a new repo is added.
Clean up one unnecessary
nullcheck onmainRepositoryMapping.Fixes #27061
Closes #27081.
PiperOrigin-RevId: 818857131
Change-Id: I5036444dd6b39b12063f927ad807e2a93aeaf69f
(cherry picked from commit fe3f455)