Fail PUT object with match on non-existent keys & code optimizations

[afranken]

Description

• Fail PUT object with match on non-existent keys (Fixes PutObject with IfMatch condition on etag succeeds instead of throwing NoSuchKeyException #2502)
• Remove unused imports
• Fix Kotlin 2.2 usage
• Ignore .vscode and .cursor configurations
• Minor refactorings for clarity.
• Use fixed list of StorageClass values in tests. New values added by AWS sometimes break tests. We want to make sure to test a few different storage classes, no need to test every one.

Related Issue

#2502

Tasks

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

[Copilot]

Pull Request Overview

This PR implements correct failure behavior for PUT requests with If-Match on non-existent keys, cleans up unused imports and tooling configs, updates Kotlin compiler settings, refactors test support for stability, and bumps the version to 4.6.0-SNAPSHOT.

• Enforce NO_SUCH_KEY exception when If-Match is used on missing objects in ObjectService
• Added integration tests for if-match/if-none-match PUT semantics and fixed storage-class test enumeration
• Bumped project version and Kotlin compiler api/language levels, updated changelog, and removed unused imports

Reviewed Changes

Copilot reviewed 23 out of 24 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
testsupport/*/pom.xml	Bumped snapshot versions to 4.6.0-SNAPSHOT
testsupport/common/src/.../S3MockStarter.java and DigestUtil.java	Removed unused @NonNull imports
server/src/.../StoreConfiguration.java	Switched to mockRegion.id() for bucket creation
server/src/.../ObjectService.java	Throw NO_SUCH_KEY when matching non-existent objects and refactored conditions
server/src/.../S3MockProperties.java	Removed unused Region import
pom.xml (root)	Updated Kotlin compiler settings for 2.2
integration-tests/src/.../*.kt	Migrated Java-style annotations to Kotlin annotation class and added PUT tests
integration-tests/src/.../S3TestBase.kt	Replaced dynamic StorageClass stream with fixed list
Makefile	Added build, verify, and install targets
CHANGELOG.md	Advanced planned release to 4.7.0, added 4.6.0 release notes

Comments suppressed due to low confidence (2)

pom.xml:24

• The CHANGELOG shows '4.7.0 - PLANNED', but the POM is set to 4.6.0-SNAPSHOT. Consider bumping the project version to 4.7.0-SNAPSHOT to match the planned release.

  <version>4.6.0-SNAPSHOT</version>

pom.xml:86

• The CHANGELOG indicates bumping aws-v2.version to 2.31.77, but this property is still 2.31.67. Update it to 2.31.77 for consistency.

    <aws-v2.version>2.31.67</aws-v2.version>