fix: format release notification output

[jibin7jose]

Summary

Fixes #2610.

This updates the release workflow to write the action_url output using GitHub Actions multi-line output syntax. The previous name=value format failed when multiple packages were published because the release URLs were joined with newlines.

Requirements

• I've read and understood the Contributing Guidelines and have done my best effort to follow them.
• I've read and agree to the Code of Conduct.

[changeset-bot]

⚠️ No Changeset found

Latest commit: 2cd273d

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[salesforce-cla]

Thanks for the contribution! Before we can merge this, we need @jibin7jose to sign the Salesforce Inc. Contributor License Agreement.

[jibin7jose]

This workflow-only change does not require a package version bump, so no changeset was added.

[jibin7jose]

I have completed the Salesforce CLA. This PR is ready for maintainer review when workflows are approved. Thanks!

[jibin7jose]

The Salesforce CLA page shows that I already signed the CLA on 2026-06-21, but the salesforce-cla check still reports One or more contributors need to sign the CLA.

Could a maintainer please refresh/re-run the CLA check when possible?

[jibin7jose]

Hi maintainers,
I completed the Salesforce CLA and verified it is signed, but the salesforce-cla check still shows cla:missing.
Could someone please re-run or refresh the CLA check?
Also, workflows appear to be awaiting maintainer approval before CI can start.
Thanks!