Include a `schema-tools` diff of the downstream schema

[iwahbe]

Hello!

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Issue details

The ecosystem team relies on downstream tests to ensure we don't introduce breaking changes to our tier 1 providers (and implicitly all other providers) when we enhance the bridge. In general, bridge changes should not result in any schema diff, and never a breaking change in the schema. Downstream tests should report schema diffs and breaking changes on the downstream provider.

We can use https://github.com/pulumi/schema-tools for this.

Affected area/feature

[t0yv0]

Or https://github.com/pulumi/pulumi-terraform-bridge/issues/1166