Merge #11578

11578: Don't use *schema.Package in python codegen r=iwahbe a=iwahbe

Part of #9932

tldr: `Package` is not reliable when its used for an external package. We are transferring over to `PackageReference`, and will remove the `Package` field once all references to it have been removed.

Co-authored-by: Ian Wahbe <ian@wahbe.com>

pkg/codegen/python/doc.go

@@ -76,7 +76,7 @@ func (d DocLanguageHelper) GetDocLinkForFunctionInputOrOutputType(pkg *schema.Pa
 func (d DocLanguageHelper) GetLanguageTypeString(pkg *schema.Package, moduleName string, t schema.Type, input bool) string {
 	typeDetails := map[*schema.ObjectType]*typeDetails{}
 	mod := &modContext{
-		pkg:         pkg,
+		pkg:         pkg.Reference(),
 		mod:         moduleName,
 		typeDetails: typeDetails,
 	}
@@ -114,7 +114,7 @@ func (d DocLanguageHelper) GetMethodResultName(pkg *schema.Package, modName stri
 		if info.LiftSingleValueMethodReturns && m.Function.Outputs != nil && len(m.Function.Outputs.Properties) == 1 {
 			typeDetails := map[*schema.ObjectType]*typeDetails{}
 			mod := &modContext{
-				pkg:         pkg,
+				pkg:         pkg.Reference(),
 				mod:         modName,
 				typeDetails: typeDetails,
 			}