test(polly-request-presigner): make polly presigner test compatible with model change

[smilkuri]

Issue

Internal P293169653

Description

The integration test was failing due to changes in the model.json, because the test assertions were too precise and expected
exact values.

• Updated X-Amz-Date regex from \d{8}T\d+Z to \d{8}T\d{6}Z for precise timestamp format
• Updated X-Amz-Signature regex from (.*?) to [a-f0-9]+ for hex signature validation
• Updated X-Amz-SignedHeaders regex to accept both 'host' and '%3Aauthority' values

Testing

For existing model

dev-dsk-smilkuri-1a-17aece6b % yarn test:integration

 RUN  v3.2.4 /local/home/smilkuri/aws-sdk-js-v3/packages/polly-request-presigner

 ✓ src/polly-request-presigner.integ.spec.ts (1 test) 19ms
   ✓ polly-request-presigner > should sign URLs 18ms

 Test Files  1 passed (1)
      Tests  1 passed (1)
   Start at  19:23:50
   Duration  558ms (transform 130ms, setup 0ms, collect 225ms, tests 19ms, environment 0ms, prepare 133ms)
   

For new model

Regenerated and built the client for latest model and tested it with yarn test:integartion

$ b client polly - gen,b

dev-dsk-smilkuri-1a-17aece6b % yarn test:integration

 RUN  v3.2.4 /local/home/smilkuri/aws-sdk-js-v3/packages/polly-request-presigner

 ✓ src/polly-request-presigner.integ.spec.ts (1 test) 19ms
   ✓ polly-request-presigner > should sign URLs 18ms

 Test Files  1 passed (1)
      Tests  1 passed (1)
   Start at  19:36:39
   Duration  562ms (transform 130ms, setup 0ms, collect 237ms, tests 19ms, environment 0ms, prepare 122ms)

Additional context

Add any other context about the PR here.

Checklist

• [n/a] If the PR is a feature, add integration tests (*.integ.spec.ts).
• [n/a] If you wrote E2E tests, are they resilient to concurrent I/O?
• [n/a] If adding new public functions, did you add the @public tag and enable doc generation on the package?

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