[Infra] Fix incorrectly named GHA job (#10078)

Author: ncooke3

.github/workflows/watchos-sample.yml

@@ -25,8 +25,7 @@ concurrency:
     cancel-in-progress: true
 
 jobs:
-
-  tv-sample-build-test:
+  watchos-sample-build-test:
     # Don't run on private repo unless it is a PR.
     if: (github.repository == 'Firebase/firebase-ios-sdk' && github.event_name == 'schedule') || github.event_name == 'pull_request'
     runs-on: macos-12