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):

registry/.github/workflows/generate-package-metadata.yml

Lines 74 to 81 in 3d046d0

	# We only need to run the following steps if resourcedocsgen found a newer version of the community provider.
	- name: Generate Package Metadata
	if: env.PROVIDER_VERSION
	run: >-
	./tools/resourcedocsgen/resourcedocsgen metadata from-github
	--repoSlug "${{ matrix.repoSlug }}"
	--schemaFile "${{ matrix.schemaFile }}"
	--version "${{ env.PROVIDER_VERSION }}"

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

Affected area/feature

This would have prevented #6488.