test(linter): increase stability of tsgolint test cases (#15063)

current test cases are unnecessarily complex. this results in unstable tests due to non-determinestic multi threaded behaviour when running tsgo.

This PR improves the stability of these test cases by simplifying the test cases, reducing the variance when running type aware linting.

Author: camc314

apps/oxlint/fixtures/tsgolint/await-thenable.ts

@@ -0,0 +1 @@
+await 12;

apps/oxlint/fixtures/tsgolint/await-thenable/index.ts

@@ -0,0 +1,2 @@
+declare const arr: number[];
+delete arr[0];

apps/oxlint/fixtures/tsgolint/no-array-delete.ts

@@ -0,0 +1 @@
+({}).toString();

apps/oxlint/fixtures/tsgolint/no-array-delete/index.ts

@@ -0,0 +1,2 @@
+declare function bar(): void;
+const foo = () => void bar();

apps/oxlint/fixtures/tsgolint/no-base-to-string.ts

@@ -0,0 +1 @@
+type T1 = 'A' | 'A';