Close HTTP response streams when interceptors throw

[afarber]

Motivation and Context

Fixes #5005.

A synchronous HTTP response stream could leak when a response execution interceptor threw an exception before the response handler took ownership of the stream.

Modifications

• Close synchronous response streams when afterTransmission or beforeUnmarshalling interceptors throw.
• Close the current response stream when modifyHttpResponse or modifyHttpResponseContent throws.
• Add regression coverage for all affected response interceptor hooks.
• Add a changelog entry.

Testing

./mvnw -pl :sdk-core -am \
  -Dtest=SyncClientHandlerInterceptorExceptionTest \
  -Dsurefire.failIfNoSpecifiedTests=false \
  -Dspotbugs.skip=true test

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 (https://github.com/aws/aws-sdk-java-v2/blob/master/CONTRIBUTING.md) 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.
• My change is to implement 1.11 parity feature and I have updated LaunchChangelog
  (https://github.com/aws/aws-sdk-java-v2/blob/master/docs/LaunchChangelog.md)

License

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