Validate branch name in preview release workflow

[CarlosCortizasCT]

Summary

Validate branch name in preview release workflow

Description

We detected some attempts to exploit the new workflow for preview releases so we want to include a quick and simple validation for the branch names we use in order to protect the flow.

We now only allow numbers, letters, underscores, and hyphens in the branch name.

[vercel]

The latest updates on your projects. Learn more about Vercel for Git ↗︎

Name	Status	Preview	Comments	Updated (UTC)
mc-app-kit-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 2, 2024 10:49am
merchant-center-application-kit-components-playground	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Dec 2, 2024 10:49am

[changeset-bot]

⚠️ No Changeset found

Latest commit: 7376b60

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.

This PR includes no changesets

When changesets are added to this PR, you'll see the packages that this PR includes changesets for and the associated semver types

Click here to learn what changesets are, and how to add one.

Click here if you're a maintainer who wants to add a changeset to this PR

[emmenko]

Thanks!