fix(cmt): use macos-26 and ubuntu-latest for desktop CMT matrix

[yasserfaraazkhan]

Summary

• Desktop CMT hardcodes macos-13 / ubuntu-22.04 in buildDesktopCMTMatrixJSON
• macos-13 is retired by GitHub, so RC CMT macOS jobs queue forever (seen on desktop CMT run 30258289129)
• Send macos-26 + ubuntu-latest instead, matching desktop PR E2E

Test plan

• go test ./server/ -run 'TestDryRun_DesktopCMT|TestE2E' -count=1
• Merge, tag v0.4.16, bump gitops-platform image (gitops#78)
• After deploy: re-run Desktop CMT Provisioner and confirm macOS jobs start on macos-26

NONE

[mm-cloud-bot]

@yasserfaraazkhan: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

Details

I understand the commands that are listed here

[coderabbitai]

📝 Walkthrough

Walkthrough

The desktop CMT matrix now uses updated Linux and macOS runners. The schema test explicitly verifies the Linux, macOS, and Windows runner mappings.

Changes

Desktop CMT runners

Layer / File(s)	Summary
Update and validate desktop runner mappings server/workflow_run.go, server/e2e_dryrun_test.go	The matrix changes Linux to ubuntu-latest and macOS to macos-26; the schema test asserts these mappings along with Windows windows-2022.

Estimated code review effort: 2 (Simple) | ~10 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Title check	✅ Passed	The title clearly names the desktop CMT matrix runner update and matches the changeset.
Description check	✅ Passed	The description directly explains the same runner-label update and why it was needed.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/cmt-desktop-macos-26-runners

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_{Comment @coderabbitai help to get the list of available commands.}

[mm-cloud-bot]

@yasserfaraazkhan: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

Details

I understand the commands that are listed here

[mm-cloud-bot]

@yasserfaraazkhan: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

Details

I understand the commands that are listed here

[mm-cloud-bot]

@yasserfaraazkhan: Adding the "do-not-merge/release-note-label-needed" label because no release-note block was detected, please follow our release note process to remove it.

Details

I understand the commands that are listed here