Issue

Noticed in #7906

Description

Migrates endpoint tests from jest to vitest

Testing

Before

Tests are run using jest

$ aws-sdk-js-v3> make test-endpoints
npx jest -c ./tests/endpoints-2.0/jest.config.js --bail --verbose false
 PASS  tests/endpoints-2.0/endpoints-integration.spec.ts (22.277 s)

Test Suites: 1 passed, 1 total
Tests:       5 skipped, 13901 passed, 13906 total
Snapshots:   0 total
Time:        22.367 s
Ran all test suites.

After

Tests are run using vitest

$ aws-sdk-js-v3> make test-endpoints
...
 Test Files  1 passed (1)
      Tests  13901 passed | 5 skipped (13906)
   Start at  18:21:06
   Duration  7.81s (transform 50ms, setup 0ms, import 5.52s, tests 1.94s, environment 0ms)

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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