ci: trigger platform-api cloud release on push, not pull_request

[renuka-fernando]

Purpose

Follow-up to #3311. The Platform API Cloud Release workflow triggered on pull_request: [closed], but a pull_request run for a PR opened from a fork receives no repository secrets. Merges of fork PRs therefore failed the pre-flight check with AZURE_WEBHOOK_URL / AZURE_WEBHOOK_SECRET unset, and only a manual workflow_dispatch could trigger the Azure build.

Approach

• Switch the trigger from pull_request: [closed] to push on the release branches (main, platform-api/v0.10.x). A merge produces a push, which runs with full secret access and executes the workflow version that lives on the pushed branch.
• Drop the now-unneeded merged-PR if: guard.
• Replace the pull_request-specific BRANCH/COMMIT expressions with github.ref_name / github.sha, which are correct for both push and workflow_dispatch.

Related Issues

N/A — follow-up to #3311.

Automation tests

N/A — CI workflow change only.

Security checks

• Followed secure coding standards? yes
• Confirmed that this PR doesn't commit any keys, passwords, tokens, usernames, or other secrets? yes — the secret is still read from secrets.AZURE_WEBHOOK_SECRET.

Checklist

• Tests added or updated (unit, integration, etc.)
• Samples updated (if applicable)

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