Validate new providers

[iwahbe]

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Issue details

Before a provider is added to the Pulumi Registry, it needs to have a valid schema and valid docs. We should run a check on changes to community-packages/package-list.json, ensuring that any added package is valid. This could be as simple as invoking resourcedocsgen premptily (not just after the merge):

https://github.com/pulumi/registry/blob/3d046d0aeeaebca0cf8641b475ed9cfc7f1399c8/.github/workflows/generate-package-metadata.yml#L74-L81

That would guarantee that the first published version would be correct.

Affected area/feature

This would have prevented #6488.