Disable mac app pipeline

[rtibbles]

Summary

Disables the mac app buildkite pipeline trigger. All mac app assets must now be manually built using the Github Action workflow on the repository.

References

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Reviewer guidance

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Testing checklist

• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical user journeys are covered by Gherkin stories
• Critical and brittle code paths are covered by unit tests

PR process

• PR has the correct target branch and milestone
• PR has 'needs review' or 'work-in-progress' label
• If PR is ready for review, a reviewer has been added. (Don't use 'Assignees')
• If this is an important user-facing change, PR or related issue has a 'changelog' label
• If this includes an internal dependency change, a link to the diff is provided

Reviewer checklist

• Automated test coverage is satisfactory
• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

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• To see the specific tasks where the Asana app for GitHub is being used, see below:
  • https://app.asana.com/0/0/1202178874447018

[DXCanas]

LGTM! as long as all the other GHA pieces are in place?

[rtibbles]

Yeah, we'll be manually building any Mac assets via the Github Action manual workflow now.