ci(cmt): backport RC-tag trigger and macOS Bash 3.2 fix to release-6.2

[yasserfaraazkhan]

release-6.2 CMT Provisioner only had workflow_dispatch (no RC tag push), so v6.2.3-rc.* never auto-triggered Matterwick. Port the RC-tag trigger from #3846, the Bash 3.2 Zephyr env fix needed for macos-26 CMT legs, and update matrix schema comments for Matterwick ≥ v0.4.16 (#3920). Automated cherry-picks conflicted; same approach as #3934 on release-6.3.

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Checklist

• Added or updated unit tests (required for all new features)
• Has UI changes
• read and understood our Contributing Guidelines
• completed Mattermost Contributor Agreement
• executed npm run lint:js for proper code formatting
• Run E2E tests by adding label E2E/Run

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