test(signature-v4-multi-region): use long-lived resources for sigv4a events test

[siddsriv]

Issue

Internal JS-5884

Description

long-lived resources for events e2e test for sigv4a

Testing

 ✓ src/cloudfront-kvs-sigv4a.e2e.spec.ts (2) 7574ms
 ✓ src/eventbridge-sigv4a-put-api.e2e.spec.ts (2) 1043ms

 Test Files  2 passed (2)
      Tests  4 passed (4)
   Start at  19:21:04
   Duration  8.33s (transform 478ms, setup 0ms, collect 1.01s, tests 8.62s, environment 0ms, prepare 156ms)

Checklist

• If you wrote E2E tests, are they resilient to concurrent I/O?

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