fix(40609): add tests to cover TemplateLiteralType extraction (microsoft#40834)

Author: a-tarasyuk

tests/cases/fourslash/refactorExtractType71.ts

@@ -0,0 +1,17 @@
+/// <reference path='fourslash.ts' />
+
+////const key = "key";
+////type Foo = /*a*/`${typeof key}Foo`/*b*/;
+
+goTo.select("a", "b");
+edit.applyRefactor({
+    refactorName: "Extract type",
+    actionName: "Extract to type alias",
+    actionDescription: "Extract to type alias",
+    newContent: [
+        "const key = \"key\";",
+        "type /*RENAME*/NewType = `${typeof key}Foo`;",
+        "",
+        "type Foo = NewType;"
+    ].join("\n"),
+});