Add http client test suite for long-running request patterns

[Fred1155]

Motivation and Context

This change adds a shared, cross-client test suite that validates timeout behavior for long running request patterns across all HTTP client implementations.

Modifications

Added a shared test suite under test/http-client-tests that each HTTP client module extends:

• SdkHttpClientLongRunningRequestTestSuite — sync clients (Apache, Apache5, URL Connection, CRT sync)
• SdkAsyncHttpClientLongRunningRequestTestSuite — async clients (Netty, CRT async)
• LongRunningRequestTestSupport — shared WireMock stubs and the time-bound assertion helper
  Each suite contains three tests that validate the client fails fast rather than hanging when a timeout is configured and the server misbehaves:

Testing

Screenshots (if appropriate)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)

Checklist

• I have read the CONTRIBUTING document
• Local run of mvn install succeeds
• My code follows the code style of this project
• My change requires a change to the Javadoc documentation
• I have updated the Javadoc documentation accordingly
• I have added tests to cover my changes
• All new and existing tests passed
• I have added a changelog entry. Adding a new entry must be accomplished by running the scripts/new-change script and following the instructions. Commit the new file created by the script in .changes/next-release with your changes.
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog

License

• I confirm that this pull request can be released under the Apache 2 license

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