OAT: Add upgrade button for DTDL v3

[msnyder-msft]

Summary of changes 🔍

V2 models have the option to upgrade to v3

Testing 🧪

[ Add any special instructions needed to test or view your changes such as environment URLs or other config details. ]

Checklist ✔️

• [ ] Linked associated issue (if present)
• [ ] Added relevant labels
• [ ] Requested developer reviews
• [ ] Request UI review from design / PM
• [ ] Verify all code checks are passing

[iremgokce]

Left couple of nit comments, haven't run it yet though. Code looks good to me!

[github-actions[bot]]

:tada: This PR is included in version 1.0.0-beta.363 :tada:

The release is available on:

• npm package (@beta dist-tag)
• GitHub release

Your semantic-release bot :package::rocket: