fix(workflows): run the Mage-OS Suite testsuite, not a removed one (#371)

The workflow strips the upstream "Memory Usage Tests" and "Magento
Integration Tests Real Suite" testsuites from phpunit.xml.dist, then
injects a new "Mage-OS Suite" containing the shard's directories.
However, the run command still passed --testsuite 'Magento Integration
Tests' — a name that no longer exists in upstream phpunit.xml.dist —
causing PHPUnit to print "No tests executed!" on every shard.

Invoke the suite the workflow actually builds.

Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

Author: rhoerr

.github/workflows/full-integration-tests.yaml

@@ -242,8 +242,8 @@ jobs:
         working-directory: ./main
         run: |
           export WARDEN="$(dirname $(pwd))/warden/bin/warden"
-          # Important: Run the custom "Magento Integration Tests" test suite, which runs all other test suites
-          ${WARDEN} env exec -T --workdir /var/www/html/dev/tests/integration php-fpm ../../../vendor/bin/phpunit --configuration phpunit.xml.dist --testsuite 'Magento Integration Tests' --log-junit=../../../phpunit-output/junit/res-log.xml
+          # Run the "Mage-OS Suite" testsuite injected above, which contains this shard's directories
+          ${WARDEN} env exec -T --workdir /var/www/html/dev/tests/integration php-fpm ../../../vendor/bin/phpunit --configuration phpunit.xml.dist --testsuite 'Mage-OS Suite' --log-junit=../../../phpunit-output/junit/res-log.xml
 
   rum-memory-integration-tests:
     needs: [ matrix-calculator ]