Do not store "aws-chunked" encoding

[afranken]

Description

AWS docs specify that this encoding is not persisted or returned if it's the only value sent in the "Content-Encoding" header.

Related Issue

Fixes #2218

Tasks

• I have signed the CLA.
• I have written tests and verified that they fail without my change.

[Copilot]

Pull Request Overview

This PR updates the logic for storing HTTP headers so that the "aws-chunked" content-encoding is not persisted when it is the only value and also improves method naming and tests to support the change.

• Updated HeaderUtil.java to conditionally exclude "aws-chunked" if it is the sole encoding header.
• Renamed methods and updated ServiceBase.java to use the new logic.
• Adjusted tests in AwsChunkedEncodingIT.kt and modified the cleanup logic in S3TestBase.kt.

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
server/src/main/java/com/adobe/testing/s3mock/util/HeaderUtil.java	Updates header storage logic and adds helper method to detect sole "aws-chunked" encoding.
server/src/main/java/com/adobe/testing/s3mock/service/ServiceBase.java	Refactors usage of header-checking methods to align with updated HeaderUtil.java.
integration-tests/src/test/kotlin/com/adobe/testing/s3mock/its/S3TestBase.kt	Removes condition that previously skipped cleanup of a specific test bucket.
integration-tests/src/test/kotlin/com/adobe/testing/s3mock/its/AwsChunkedEncodingIT.kt	Fixes a typo in the test class name and updates tests to assert the absence of "aws-chunked" encoding.
CHANGELOG.md	Updates version information and changelog content to reflect the new changes.

Comments suppressed due to low confidence (1)

integration-tests/src/test/kotlin/com/adobe/testing/s3mock/its/S3TestBase.kt:229

• The removal of the condition that skips the 'testputandgetretention-545488000' bucket in cleanupStores might lead to unintended deletion of this special test bucket. Consider reintroducing the condition or adding a comment to clarify the intended change.

if(bucket.name() == "testputandgetretention-545488000") {return}