command/jsonconfig: Use correct provider address to access schema

There was a remaining TODO in this package to find the true provider FQN
when looking up the schema for a resource type. We now have that data
available in the Provider field of configs.Resource, so we can now
complete that change.

The tests for this functionality actually live in the parent "command"
package as part of the tests for the "terraform show" command, so this
fix is verified by all of the TestShow... tests now passing except one,
and that remaining one is failing for some other reason which we'll
address in a later commit.

command/jsonconfig/config.go

@@ -303,15 +303,13 @@ func marshalResources(resources map[string]*configs.Resource, schemas *terraform
 			}
 		}
 
-		// TODO: get actual providerFqn
-		providerFqn := addrs.NewLegacyProvider(v.ProviderConfigAddr().LocalName)
 		schema, schemaVer := schemas.ResourceTypeConfig(
-			providerFqn,
+			v.Provider,
 			v.Mode,
 			v.Type,
 		)
 		if schema == nil {
-			return nil, fmt.Errorf("no schema found for %s", v.Addr().String())
+			return nil, fmt.Errorf("no schema found for %s (in provider %s)", v.Addr().String(), v.Provider)
 		}
 		r.SchemaVersion = schemaVer
 

command/jsonplan/plan.go

@@ -183,7 +183,7 @@ func (p *plan) marshalResourceChanges(changes *plans.Changes, schemas *terraform
 			addr.Resource.Resource.Type,
 		)
 		if schema == nil {
-			return fmt.Errorf("no schema found for %s", r.Address)
+			return fmt.Errorf("no schema found for %s (in provider %s)", r.Address, rc.ProviderAddr.Provider)
 		}
 
 		changeV, err := rc.Decode(schema.ImpliedType())

command/jsonstate/state.go

@@ -291,7 +291,7 @@ func marshalResources(resources map[string]*states.Resource, module addrs.Module
 				current.SchemaVersion = ri.Current.SchemaVersion
 
 				if schema == nil {
-					return nil, fmt.Errorf("no schema found for %s", resAddr.String())
+					return nil, fmt.Errorf("no schema found for %s (in provider %s)", resAddr.String(), r.ProviderConfig.Provider)
 				}
 				riObj, err := ri.Current.Decode(schema.ImpliedType())
 				if err != nil {