fix: update fetchOpenPullRequests method to pass organisation in github action workflow for prioritization

[godwingrs22]

Issue # (if applicable)

N/A

Reason for this change

PR Prioritization R5 Check and PR Prioritization R2 Check github action workflow is failing since it is not able to call the graphql api with the repo owner.

GraphqlResponseError: Request failed due to following response errors:
 - Variable $owner of type String! was provided invalid value
    at /home/runner/work/_actions/actions/github-script/v7/dist/index.js:6669:[13](https://github.com/aws/aws-cdk/actions/runs/12902208172/job/36014470718#step:3:14)
Error: Unhandled error: GraphqlResponseError: Request failed due to following response errors:
 - Variable $owner of type String! was provided invalid value

Description of changes

R2 and R5 prioritization uses fetchOpenPullRequests method that needs to be updated with organisation parameter and query as the aws-cdk repo is under aws org.

Describe any new or updated permissions being added

N/A

Description of how you validated changes

Ran unit test and tested in local repo.

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[aws-cdk-automation]

The pull request linter fails with the following errors:

❌ Fixes must contain a change to an integration test file and the resulting snapshot.

If you believe this pull request should receive an exemption, please comment and provide a justification. A comment requesting an exemption should contain the text Exemption Request. Additionally, if clarification is needed, add Clarification Request to a comment.

✅ A exemption request has been requested. Please wait for a maintainer's review.

[godwingrs22]

Exemption Request: The change is on the github action script and doesn't need a integ test.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.52%. Comparing base (d6e3c61) to head (a44d3ff).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #33073   +/-   ##
=======================================
  Coverage   81.52%   81.52%           
=======================================
  Files         224      224           
  Lines       13762    13762           
  Branches     2414     2414           
=======================================
  Hits        11220    11220           
  Misses       2270     2270           
  Partials      272      272           

Flag	Coverage Δ
suite.unit	81.52% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
packages/aws-cdk	80.93% <ø> (ø)
packages/aws-cdk-lib/core	82.15% <ø> (ø)

✅ Updated pull request passes all PRLinter validations. Dismissing previous PRLinter review.

[aws-cdk-automation]

AWS CodeBuild CI Report

• CodeBuild project: AutoBuildv2Project1C6BFA3F-wQm2hXv2jqQv
• Commit ID: a44d3ff
• Result: SUCCEEDED
• Build Logs (available for 30 days)

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[mergify]

Thank you for contributing! Your pull request will be updated from main and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).

[github-actions]

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