chore: move tests of getSchemaType close to the implementation of that feature

Author: mlewando

src/tests/issues/issue90.typesOrRefs.test.ts renamed to src/utils/getSchemaType.test.ts

@@ -1,5 +1,5 @@
-import { compileSchema } from "../../compileSchema";
-import { getSchemaType } from "../../utils/getSchemaType";
+import { compileSchema } from "../compileSchema";
+import { getSchemaType } from "./getSchemaType";
 import { strict as assert } from "assert";
 
 describe("issue#90 - types or refs", () => {