ci: Skip integration tests on metadata-only changes (#12134)

There's no reason to run all of the (sometimes flakey) integration if we are
only changing chart metadata (i.e. version bumps). We will continue to run
integration tests if helm templates or values change.

.github/workflows/integration.yml

@@ -8,6 +8,9 @@ on:
       - '**/*.go'
       - '**/Dockerfile*'
       - Cargo.lock
+      # Don't run integration tests if only the Chart metadata has changed.
+      - '!**/Chart.yaml'
+      - '!**/README*'
       - charts/**
       - go.sum
       - justfile