ci: add stale theme pull request closer action push (#2067)

This commit adds the `stale-theme-pr-closer` closer action. This action
is used to close theme pull requests with an `invalid` label that has
been stale for a given number of `STALE_DAYS`.

.github/workflows/e2e-test.yml

@@ -3,10 +3,11 @@ on:
   deployment_status:
 
 jobs:
-  preview:
+  e2eTests:
     if:
       github.event_name == 'deployment_status' &&
       github.event.deployment_status.state == 'success'
+    name: Perform 2e2 tests
     runs-on: ubuntu-latest
     strategy:
       matrix: