test(nx-plugin-e2e): remove flaky "--verbose" substring assertion

Fails when run in Nx Cloud on a commit which happens to have
"--verbose" in the title (such as this one or parent).

The verbose argument handling is already tested in
executor.unit.test.ts, so it's not necessary to test such
a non-critical feature again in E2E tests.

Author: matejchalk

e2e/nx-plugin-e2e/tests/plugin-create-nodes.e2e.test.ts

@@ -179,8 +179,6 @@ describe('nx-plugin', () => {
     // Run CLI executor
     expect(cleanStdout).toContain('DryRun execution of:');
     expect(cleanStdout).toContain('npx @code-pushup/cli');
-    expect(cleanStdout).not.toContain('--verbose');
-    expect(cleanStdout).toContain('CP_VERBOSE="true"');
   });
 
   it('should consider plugin option bin in executor target', async () => {