MM-53002: Fix ESR CI (#23599)

* Do not use the mattermost path

The /mattermost path is used by the image and it seems to conflict with
the container running the binary

* Use a regular machine in the esr-upgrade-diff job

* Add missing space

.github/workflows/esrupgrade-common.yml

@@ -61,8 +61,8 @@ jobs:
             --env-file=dotenv/test.env \
             --env MM_SQLSETTINGS_DRIVERNAME="mysql" \
             --env MM_SQLSETTINGS_DATASOURCE="mmuser:mostest@tcp(mysql:3306)/mattermost_test?charset=utf8mb4,utf8&multiStatements=true&maxAllowedPacket=4194304" \
-            -v ~/work/mattermost:/mattermost \
-            -w /mattermost/mattermost \
+            -v ~/work/mattermost:/mm \
+            -w /mm \
             $BUILD_IMAGE &
           # In parallel, wait for the migrations to finish.
           # To verify this, we check that the server has finished the startup job through the log line "Server is listening on"
@@ -139,7 +139,7 @@ jobs:
           name: upgraded-dump-script
           path: ${{ env.DUMP_SCRIPT_NAME }}.gz
   esr-upgrade-diff:
-    runs-on: ubuntu-latest-8-cores
+    runs-on: ubuntu-latest
     needs:
       - esr-upgrade-server
       - esr-upgrade-script