Repo gardening: update to use new consolidated task (#7009)

.github/workflows/gardening.yml

@@ -42,5 +42,4 @@ jobs:
          slack_team_channel: ${{ secrets.SLACK_TEAM_CHANNEL }}
          slack_he_triage_channel: ${{ secrets.SLACK_HE_TRIAGE_CHANNEL }}
          slack_quality_channel: ${{ secrets.SLACK_QUALITY_CHANNEL }}
-         slack_kitkat_channel: ${{ secrets.SLACK_KITKAT_CHANNEL }}
-         tasks: 'cleanLabels,flagOss,triageNewIssues,gatherSupportReferences,replyToCustomersReminder,notifyKitKat'
+         tasks: 'cleanLabels,flagOss,triageIssues,gatherSupportReferences,replyToCustomersReminder'