Clean up at .github due to repo rename (#23580)

* update .github after repo rename

* update

* Update PULL_REQUEST_TEMPLATE.md

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Co-authored-by: M-ZubairAhmed <m-zubairahmed@protonmail.com>
Co-authored-by: Mattermost Build <build@mattermost.com>

.github/workflows/artifacts.yml

@@ -75,7 +75,7 @@ jobs:
       SENTRY_ORG: ${{ secrets.MM_SERVER_SENTRY_ORG }}
       SENTRY_PROJECT: ${{ secrets.MM_SERVER_SENTRY_PROJECT }}
     steps:
-      - name: cd/Checkout mattermost-server
+      - name: cd/Checkout mattermost project
         uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
       - name: cd/Create Sentry release
         uses: getsentry/action-release@85e0095193a153d57c458995f99d0afd81b9e5ea # v1.3.0