ci: run v3 nightly release only on 3pm UTC schedule

[leaanthony]

Remove the changelog-push trigger that was dispatching a release on
every merge to master, and move the daily schedule from 2 AM UTC to
3 PM UTC.

Summary by CodeRabbit

• Chores
  • Updated nightly release workflow schedule from 02:00 UTC to 15:00 UTC daily.
  • Removed automatic release triggering based on changelog updates; releases will now follow only the scheduled nightly workflow.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

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Review profile: CHILL

Plan: Pro

Run ID: d4f3d178-5b9f-4e5b-8ada-8a5d1f7c45e8

📥 Commits

Reviewing files that changed from the base of the PR and between a04206a and c86e435.

📒 Files selected for processing (2)

• .github/workflows/nightly-release-v3.yml
• .github/workflows/unreleased-changelog-trigger.yml

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Walkthrough

The pull request modifies GitHub Actions workflows: adjusting the nightly release schedule from 02:00 UTC to 15:00 UTC and deleting the unreleased changelog trigger workflow that conditionally dispatched releases based on changelog updates.

Changes

Cohort / File(s)	Summary
Workflow Schedule Update .github/workflows/nightly-release-v3.yml	Cron schedule adjusted from 0 2 * * * (02:00 UTC) to 0 15 * * * (15:00 UTC) for nightly releases.
Workflow Deletion .github/workflows/unreleased-changelog-trigger.yml	Deleted entire workflow that monitored v3/UNRELEASED_CHANGELOG.md on master pushes and conditionally triggered nightly-release-v3.yml via workflow_dispatch with force_release flag when changelog content was detected.

Possibly Related PRs

• fix(workflows): rewrite unreleased-changelog-trigger.yml #5281: Directly interacts with both unreleased-changelog-trigger.yml and nightly-release-v3.yml dispatch behavior.
• chore(workflows): pre-merge changelog-trigger permission from master #5270: Modifies the same unreleased-changelog-trigger.yml workflow permissions before deletion in this PR.

Estimated Code Review Effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 Hop, hop! The schedule shifts east,
Fifteen bells ring instead of two,
But the changelog watcher is gone, released,
No more conditional triggers true—
A simpler path to nightly brew! 🌙

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch claude/fix-release-schedule-sPyzv

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[Copilot]

Pull request overview

Updates v3 release automation to avoid triggering a nightly release on every merge to master, and instead rely on a single daily scheduled run at a new time.

Changes:

• Removed the unreleased-changelog-trigger.yml workflow that dispatched releases on v3/UNRELEASED_CHANGELOG.md pushes to master.
• Moved the nightly-release-v3.yml scheduled cron from 02:00 UTC to 15:00 UTC (3 PM UTC).

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
.github/workflows/unreleased-changelog-trigger.yml	Deletes the push-based dispatch workflow to stop per-merge release triggering.
.github/workflows/nightly-release-v3.yml	Adjusts the scheduled cron time to 15:00 UTC for the daily v3 nightly release job.

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