fix: Migrate notifications to reusable actions (#26792)

.github/workflows/server-test-template.yml

@@ -82,13 +82,14 @@ jobs:
           require_tests: true
       - name: Report retried tests via webhook (master || release-*)
         if: ${{ steps.report.outputs.retried > 0 && (github.ref_name == 'master' || startsWith(github.ref_name, 'release-')) }}
-        run: |
-          curl \
-            --fail \
-            -X POST \
-            -H "Content-Type: application/json" \
-            -d "{\"text\":\"#### ⚠️  One or more flaky tests detected ⚠️\\n* Failing job: [github.com/mattermost/mattermost:${{ inputs.name }}](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})\\n* Ideally, this would have been caught in a pull request, but now a volunteer is required. If you're willing to help, submit a separate pull request to skip the flaky tests (e.g. [23360](https://github.com/mattermost/mattermost/pull/23360)) and file JIRA ticket (e.g. [MM-52743](https://mattermost.atlassian.net/browse/MM-52743)) for later investigation.\\n* Finally, reply to this message with a link to the created JIRA ticket.\\n\"}" \
-            ${{ secrets.MM_COMMUNITY_DEVELOPERS_INCOMING_WEBHOOK_FROM_GH_ACTIONS }}
+        uses: mattermost/action-mattermost-notify@b7d118e440bf2749cd18a4a8c88e7092e696257a # v2.0.0
+        with:
+          MATTERMOST_WEBHOOK_URL: ${{ secrets.MM_COMMUNITY_DEVELOPERS_INCOMING_WEBHOOK_FROM_GH_ACTIONS }}
+          TEXT: |-
+            #### ⚠️ One or more flaky tests detected ⚠️
+            * Failing job: [github.com/mattermost/mattermost:${{ inputs.name }}](${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }})
+            * Ideally, this would have been caught in a pull request, but now a volunteer is required. If you're willing to help, submit a separate pull request to skip the flaky tests (e.g. [23360](https://github.com/mattermost/mattermost/pull/23360)) and file JIRA ticket (e.g. [MM-52743](https://mattermost.atlassian.net/browse/MM-52743)) for later investigation.
+            * Finally, reply to this message with a link to the created JIRA ticket.
       - name: Report retried tests (pull request)
         uses: actions/github-script@d7906e4ad0b1822421a7e6a35d5ca353c962f410 # v6.4.1
         if: ${{ steps.report.outputs.retried > 0 && !(github.ref_name == 'master' || startsWith(github.ref_name, 'release-')) }}