test!: Remove testing utils for getting GitHub token

This is no longer needed under the new API.

test/utils.ts

@@ -1,12 +0,0 @@
-export function getToken(first: boolean): string {
-  const token = process.env["GITHUB_TOKEN"] || ""
-  if (!token && first) {
-    /* eslint-disable-next-line no-console */
-    console.warn(
-      "Skipping GitHub tests. Set $GITHUB_TOKEN to run REST client and GraphQL client tests"
-    )
-    first = false
-  }
-
-  return token
-}