Run HttpMalformedRequest tests through router (#1904)

* Add links to relevant issues/PRs for failing tests

* Update codegen-server/src/main/kotlin/software/amazon/smithy/rust/codegen/server/smithy/generators/protocol/ServerProtocolTestGenerator.kt

Co-authored-by: david-perez <d@vidp.dev>

* Make `build_router_and_make_request` return the response

* Use `rustWriter.write` over `rustWriter.rust` for incomplete rust code

* Run HttpMalformedRequest tests through router

* Don't assert on operation_extension

This causes HttpMalformedRequest tests to fail.

* Refactor code to avoid repetition

* Run ktlint

* Check operation extension for regular request tests

* Run ktlint

* Remove unused parameter from `makeRequest`

* Refactor checkRequest2

* Remove `checkRequest/2`, run new-style tests for malformed http requests

- Remove `checkRequest`, `checkRequest2` in favour
  of using `makeRequest`/`makeRequest2` directly
- Run service builder tests for MalformedHttpRequest tests

* Format comment better

* Remove `RestJsonStreamingTraitsRequireLengthWithBlob` from failing tests

This test actually passes fine, but is not relevant for the server.

* Add comment about `RestJsonHttpResponseCodeDefaultsToModeledCode`

* Remove channel assertion on `makeRequest2`

* Use `checkOperationExtension` for `makeRequest2`

* Attempt to use a channel for both `makeRequest/2`

* Go back to using channel for new api and operation extension for old api

* Fix malformedHttpRequest tests

* Add block around each API's tests

* Remove unrelated file

* Mark wrong tests as failing

Marks these two tests as failing:
  - RestJsonWithPayloadExpectsImpliedContentType
  - RestJsonBodyMalformedMapNullKey
These will be fixed in https://github.com/awslabs/smithy/pull/1477

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Co-authored-by: david-perez <d@vidp.dev>