ci: update changesets to pick up new functionality

[Saadnajmi]

Platforms Impacted

• iOS
• macOS
• win32 (Office)
• windows
• android

Description of changes

We do an ugly thing where to run yarn change we have to calculate the base branch and patch/unpatch the config. we don't need this for yarn change:check because it supports a --since <ref> arg to override the config. As of changesets/changesets#1840 , the add command does too. So we can update and get rid of some ugly code :)

Verification

Tested locally

Pull request checklist

This PR has considered (when applicable):

• Automated Tests
• Documentation and examples
• Keyboard Accessibility
• Voiceover
• Internationalization and Right-to-left Layouts

[changeset-bot]

⚠️ No Changeset found

Latest commit: 0dd8b28

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