Remove GH_RAD_CI_BOT_PAT and replace it with GH APP Token

[vishwahiremat]

Description

Remove GH_RAD_CI_BOT_PAT and replace it with GH APP Token

Type of change

• This pull request fixes a bug in Radius and has an approved issue (issue link required).
• This pull request adds or changes features of Radius and has an approved issue (issue link required).
• This pull request is a minor refactor, code cleanup, test improvement, or other maintenance task and doesn't change the functionality of Radius (issue link optional).

Fixes: #issue_number

Contributor checklist

Please verify that the PR meets the following requirements, where applicable:

• An overview of proposed schema changes is included in a linked GitHub issue.
  • Yes
  • Not applicable
• A design document PR is created in the design-notes repository, if new APIs are being introduced.
  • Yes
  • Not applicable
• The design document has been reviewed and approved by Radius maintainers/approvers.
  • Yes
  • Not applicable
• A PR for the samples repository is created, if existing samples are affected by the changes in this PR.
  • Yes
  • Not applicable
• A PR for the documentation repository is created, if the changes in this PR affect the documentation or any user facing updates are made.
  • Yes
  • Not applicable
• A PR for the recipes repository is created, if existing recipes are affected by the changes in this PR.
  • Yes
  • Not applicable

[github-actions]

Unit Tests

3 612 tests  ±0   3 610 ✅ ±0   6m 6s ⏱️ -2s
  295 suites ±0       2 💤 ±0 
    1 files   ±0       0 ❌ ±0 

Results for commit 2e36a9c. ± Comparison against base commit 87ce431.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.94%. Comparing base (87ce431) to head (2e36a9c).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8392      +/-   ##
==========================================
- Coverage   59.95%   59.94%   -0.02%     
==========================================
  Files         596      596              
  Lines       40432    40432              
==========================================
- Hits        24241    24235       -6     
- Misses      14365    14369       +4     
- Partials     1826     1828       +2     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[radius-functional-tests]

⌛ Building Radius and pushing container images for functional tests...
✅ Container images build succeeded
⌛ Publishing Bicep Recipes for functional tests...
✅ Recipe publishing succeeded
⌛ Starting ucp-cloud functional tests...
⌛ Starting corerp-cloud functional tests...
❌ Failed to install Radius for ucp-cloud functional test. Please check the logs for more details
❌ ucp-cloud functional test failed. Please check the logs for more details
❌ corerp-cloud functional test cancelled. Please check the logs for more details
⌛ Starting corerp-cloud functional tests...
⌛ Starting ucp-cloud functional tests...
✅ corerp-cloud functional tests succeeded
✅ ucp-cloud functional tests succeeded

[ytimocin]

Is there a way to test the changes before merging them in?

[ytimocin]

Should this also be an org-wide or repo-wide secret?