test: use crypto.randomUUID for resource names in e2e tests

[trivikr]

Issue

#8088

Description

Replace Math.random() and Date.now() based ID generation with
crypto.randomUUID() across all e2e spec files to guarantee uniqueness
and avoid resource name collisions in concurrent test runs.

Testing

CI

Checklist

• If the PR is a feature, add integration tests (*.integ.spec.ts) or E2E tests.
  • It's not a feature.
• My E2E tests are resilient to concurrent i/o.
  • I didn't write any E2E tests.
• I added access level annotations e.g. @public, @internal tags and enabled doc generation on the package. Remember that access level annotations go below the description, not above.
  • I didn't add any public functions.
• Streams - how do they work?? My WebStream readers/locks are properly lifecycled. Node.js stream backpressure is handled. Error handling.
  • No streams here.

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