chore(testing): disable flaky e2e test (#31504)

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## Current Behavior
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This test is flaky.

## Expected Behavior
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This test is disabled and should be investigated to see why it is flaky.

## Related Issue(s)
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merged. -->

Fixes #

e2e/cypress/src/cypress-legacy.test.ts

@@ -16,7 +16,8 @@ describe('Cypress E2E Test runner (legacy)', () => {
 
   afterAll(() => cleanupProject());
 
-  it(
+  // TODO(@leo): Please investigate why this test is flaky
+  xit(
     'should run e2e in parallel',
     async () => {
       const ngApp1 = uniq('ng-app1');