test: refactor vitest include e2e test

Refactored the vitest e2e include test to also include testing relative paths.

(cherry picked from commit cb8dea8)

Author: alan-agius4

tests/legacy-cli/e2e/tests/vitest/absolute-include.ts

@@ -0,0 +1,14 @@
+import assert from 'node:assert/strict';
+import { applyVitestBuilder } from '../../utils/vitest';
+import { ng } from '../../utils/process';
+import path from 'node:path';
+
+export default async function (): Promise<void> {
+  await applyVitestBuilder();
+
+  const { stdout: stdout1 } = await ng('test', '--include', path.resolve('src/app/app.spec.ts'));
+  assert.match(stdout1, /1 passed/, 'Expected 1 test to pass with absolute include.');
+
+  const { stdout: stdout2 } = await ng('test', '--include', path.normalize('src/app/app.spec.ts'));
+  assert.match(stdout2, /1 passed/, 'Expected 1 test to pass with relative include.');
+}