Add schedule trigger to Playground PreCommit (#37519)

* Also fix stale bot closing pinned issue

Author: Abacn

.github/workflows/README.md

@@ -271,6 +271,7 @@ PreCommit Jobs run in a schedule and also get triggered in a PR if relevant sour
 | [ PreCommit Java Thrift IO Direct ](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Java_Thrift_IO_Direct.yml) | N/A |`Run Java_Thrift_IO_Direct PreCommit`| [![.github/workflows/beam_PreCommit_Java_Thrift_IO_Direct.yml](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Java_Thrift_IO_Direct.yml/badge.svg?event=schedule)](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Java_Thrift_IO_Direct.yml?query=event%3Aschedule) |
 | [ PreCommit Java Tika IO Direct ](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Java_Tika_IO_Direct.yml) | N/A |`Run Java_Tika_IO_Direct PreCommit`| [![.github/workflows/beam_PreCommit_Java_Tika_IO_Direct.yml](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Java_Tika_IO_Direct.yml/badge.svg?event=schedule)](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Java_Tika_IO_Direct.yml?query=event%3Aschedule) |
 | [ PreCommit Kotlin Examples ](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Kotlin_Examples.yml) | N/A | `Run Kotlin_Examples PreCommit` | [![.github/workflows/beam_PreCommit_Kotlin_Examples.yml](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Kotlin_Examples.yml/badge.svg?event=schedule)](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Kotlin_Examples.yml?query=event%3Aschedule) |
+| [ PreCommit Playground ](https://github.com/apache/beam/actions/workflows/beam_Playground_Precommit.yml) | N/A | N/A | [![.github/workflows/beam_Playground_Precommit.yml](https://github.com/apache/beam/actions/workflows/beam_Playground_Precommit.yml/badge.svg?event=schedule)](https://github.com/apache/beam/actions/workflows/beam_Playground_Precommit.yml?query=event%3Aschedule) |
 | [ PreCommit Portable Python ](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Portable_Python.yml) | ['3.9','3.11','3.12'] | `Run Portable_Python PreCommit` | [![.github/workflows/beam_PreCommit_Portable_Python.yml](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Portable_Python.yml/badge.svg?event=schedule)](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Portable_Python.yml?query=event%3Aschedule) |
 | [ PreCommit Python ](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Python.yml) | ['3.9','3.10','3.11','3.12'] | `Run Python PreCommit (matrix_element)` | [![.github/workflows/beam_PreCommit_Python.yml](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Python.yml/badge.svg?event=schedule)](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Python.yml?query=event%3Aschedule) |
 | [ PreCommit Python Coverage ](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Python_Coverage.yml) | N/A | `Run Python_Coverage PreCommit`| [![.github/workflows/beam_PreCommit_Python_Coverage.yml](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Python_Coverage.yml/badge.svg?event=schedule)](https://github.com/apache/beam/actions/workflows/beam_PreCommit_Python_Coverage.yml?query=event%3Aschedule) |

.github/workflows/beam_Playground_Precommit.yml

@@ -19,7 +19,7 @@ on:
   workflow_dispatch:
   pull_request_target:
     paths:
-      - .github/workflows/playground_backend_precommit.yml
+      - .github/workflows/beam_Playground_Precommit.yml
       - playground/backend/**
   schedule:
     - cron: '10 2/6 * * *'

.github/workflows/stale.yml

@@ -42,4 +42,5 @@ jobs:
         days-before-issue-stale: 150
         days-before-issue-close: 30
         exempt-pr-labels: "pinned,security"
+        exempt-issue-labels: "pinned,security"
         operations-per-run: 100