Remove stale since giteabot has similiar feature (#28401)

Replace #27447

.github/stale.yml

@@ -1,54 +0,0 @@
-# Configuration for probot-stale - https://github.com/probot/stale
-
-# Number of days of inactivity before an Issue or Pull Request becomes stale
-daysUntilStale: 60
-
-# Number of days of inactivity before an Issue or Pull Request with the stale label is closed.
-# Set to false to disable. If disabled, issues still need to be closed manually, but will remain marked as stale.
-daysUntilClose: 14
-
-# Issues or Pull Requests with these labels will never be considered stale. Set to `[]` to disable
-exemptLabels:
-  - status/blocked
-  - kind/security
-  - lgtm/done
-  - reviewed/confirmed
-  - priority/critical
-  - kind/proposal
-
-# Set to true to ignore issues in a project (defaults to false)
-exemptProjects: false
-
-# Set to true to ignore issues in a milestone (defaults to false)
-exemptMilestones: false
-
-# Label to use when marking as stale
-staleLabel: stale
-
-# Comment to post when marking as stale. Set to `false` to disable
-markComment: >
-  This issue has been automatically marked as stale because it has not had recent activity.
-  I am here to help clear issues left open even if solved or waiting for more insight.
-  This issue will be closed if no further activity occurs during the next 2 weeks.
-  If the issue is still valid just add a comment to keep it alive.
-  Thank you for your contributions.
-
-# Comment to post when closing a stale Issue or Pull Request.
-closeComment: >
-  This issue has been automatically closed because of inactivity.
-  You can re-open it if needed.
-
-# Limit the number of actions per hour, from 1-30. Default is 30
-limitPerRun: 1
-
-# Optionally, specify configuration settings that are specific to just 'issues' or 'pulls':
-pulls:
-  daysUntilStale: 60
-  daysUntilClose: 60
-  markComment: >
-    This pull request has been automatically marked as stale because it has not had
-    recent activity. It will be closed if no further activity occurs during the next 2 months. Thank you
-    for your contributions.
-  closeComment: >
-    This pull request has been automatically closed because of inactivity.
-    You can re-open it if needed.