test(middleware-host-header): add test for :authority header in integ test

[siddsriv]

Issue

Internal JS-4777

Description

Adds a test case in integration test to check that the :authority pseudo-header is set when using HTTP/2.0

Testing

Integration tests pass.

 PASS  src/middleware-host-header.integ.spec.ts
  middleware-host-header
    SageMaker
      ✓ should set the host header (51 ms)
      ✓ should set the authority header when using http2 (3 ms)

Test Suites: 1 passed, 1 total
Tests:       2 passed, 2 total
Snapshots:   0 total
Time:        4.891 s, estimated 6 s
Ran all test suites.
Done in 5.57s.

Additional context

PR that adds the authority section of target URI to the :authority pseudo-header: #5369

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