Add a workflow to validate public API surface changes

Leverage the [kiota-dom-export-diff-tool](https://github.com/microsoftgraph/kiota-dom-export-diff-too) to check for breaking changes in our weekly generation as a PoC before adding to other languages.

For reference: 

- https://github.com/microsoftgraph/msgraph-sdk-dotnet/pull/2626
- https://github.com/microsoftgraph/msgraph-sdk-java/pull/2141