Compound DefaultInfo.Value are not supported but this is not obvious

[t0yv0]

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Issue details

Edit the GCP provider to give a default value to scopes config property for example:

			"scopes": {
				Default: &tfbridge.DefaultInfo{
					Value: []string{"defscope"},
				},
			},

This makes make tfgen fail with a cryptic error message:

error: failed to create Pulumi schema: <nil>: #/provider: doesn't validate with '/$defs/resourceSpec'; , and 6 other diagnostic(s)
make: *** [tfgen] Error 255`

In our recent conversations it turns out that the system assumes DefaultInfo.Value can only be scalar value.

A quick change that would help here would be to:

1. Annotate DefaultInfo.Value docstring with the limitations
2. Validate DefaultInfo early in the process, at the entry point to working with the provider, so unsupported values are rejected with a clear message

Affected area/feature