Merge #11997

11997: Revert "[go/sdk] Delegate alias computation to the engine" r=Zaid-Ajaj a=Zaid-Ajaj

Reverts #11935 because we removed the correct fallback behaviour of `collapseAliases`

Co-authored-by: Zaid Ajaj <Zaid-Ajaj@users.noreply.github.com>

sdk/go/pulumi/alias.go

@@ -134,3 +134,17 @@ func CreateURN(name, t, parent, project, stack StringInput) URNOutput {
 		return createURN(a[0].(string), a[1].(string), a[2].(string), a[3].(string), a[4].(string))
 	}).(URNOutput)
 }
+
+// inheritedChildAlias computes the alias that should be applied to a child based on an alias applied to it's parent.
+// This may involve changing the name of the resource in cases where the resource has a named derived from the name of
+// the parent, and the parent name changed.
+func inheritedChildAlias(childName, parentName, childType, project, stack string, parentURN URNOutput) URNOutput {
+	aliasName := StringInput(String(childName))
+	if strings.HasPrefix(childName, parentName) {
+		aliasName = parentURN.ApplyT(func(urn URN) string {
+			parentPrefix := urn[strings.LastIndex(string(urn), "::")+2:]
+			return string(parentPrefix) + childName[len(parentName):]
+		}).(StringOutput)
+	}
+	return CreateURN(aliasName, String(childType), parentURN.ToStringOutput(), String(project), String(stack))
+}