* fix: omit ObjectLockConfiguration Rule when there is no default retention
ParseBucketLockConfigurationOutput always set Rule, so a bucket with object lock enabled and no default retention answered GET ?object-lock with an empty <Rule></Rule>. AWS S3 omits the element, and the AWS SDK v2 clients that read the rule from it follow the empty element with a malformed request.
Fixes#2397
* test: cover GetObjectLockConfiguration with no default retention in the integration suite and drop the stale non-nil Rule expectation from the controller unit test
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Co-authored-by: Tung Lam <lamphamabtung96@gmail.com>
All the integration tests used to be in a single file, which had become large, messy, and difficult to maintain. These changes split `tests.go` into multiple files, organized by logical test groups.
niksis02