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

* update .github after repo rename

* update

* Update PULL_REQUEST_TEMPLATE.md

---------

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

.github/workflows/esrupgrade-common.yml

@@ -26,7 +26,7 @@ jobs:
     runs-on: ubuntu-latest-8-cores
     timeout-minutes: 30
     steps:
-      - name: Checkout mattermost-server
+      - name: Checkout mattermost project
         uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
       - name: Run docker compose
         run: |
@@ -97,7 +97,7 @@ jobs:
     runs-on: ubuntu-latest-8-cores
     timeout-minutes: 30
     steps:
-      - name: Checkout mattermost-server
+      - name: Checkout mattermost project
         uses: actions/checkout@ac593985615ec2ede58e132d2e21d2b1cbd6127c # v3.3.0
       - name: Run docker compose
         run: |