fix(gerrit): improve commit message vs pr title workaround (#32115)

lib/modules/platform/gerrit/client.spec.ts

lib/modules/platform/gerrit/client.ts

lib/modules/platform/gerrit/index.spec.ts

lib/modules/platform/gerrit/index.ts

lib/modules/platform/gerrit/readme.md

lib/modules/platform/gerrit/scm.spec.ts

lib/modules/platform/gerrit/scm.ts

lib/util/git/types.ts

lib/workers/repository/update/branch/commit.ts