chore(stale-action): default close-issue-reason is not_planned (#19110)

Co-authored-by: Michael Kriese <michael.kriese@visualon.de>

.github/workflows/stale-action.yml

@@ -36,9 +36,6 @@ jobs:
           days-before-issue-close: 7
           close-issue-message: 'This bug report has been closed as we need a reproduction to work on this. If the original poster or anybody else with the same problem discovers that they can reproduce it, please create a new issue, and reference this issue.'
 
-          # Close stale issues as "not planned" on GitHub.
-          close-issue-reason: 'not_planned'
-
           # Never label/close any pull requests.
           days-before-pr-close: -1
           days-before-pr-stale: -1