Backport of plugin: diagnostics must be checked on all schema calls into v1.2 #30997
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Backport
This PR is auto-generated from #30987 to be assessed for backporting due to the inclusion of the label 1.2-backport.
The below text is copied from the body of the original PR.
We can no longer be assured that the particular instance of a provider we are using has had
GetProviderSchema
called, so the diagnostics may not have been previously checked. Always check the diagnostics, even if we're fetching a cached response, in order to provide a more meaningful error instead of a panic in the rare case where the rpc call failed.Fixes #30655