fix: use explicit JSON merge patch type in merge patch operations

[csviri]

Fabric8's no-context patch() fetches the resource from the server and
computes an RFC 6902 JSON Patch diff, which removes the fields omitted
from a partial resource (including the whole spec). Pass an explicit
JSON_MERGE PatchContext so the non-status merge patch operations really
send application/merge-patch+json.

[Copilot]

Pull request overview

Note

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Ensures JSON Merge Patch operations use an explicit Fabric8 PatchContext with PatchType.JSON_MERGE so partial-resource merge patches don’t behave like JSON Patch diffs (which can delete omitted fields).

Changes:

• Use patch(PatchContext.of(PatchType.JSON_MERGE)) for all JSON merge patch operations in ResourceOperations.
• Add unit tests asserting merge patch calls never use no-context patch() and always use PatchType.JSON_MERGE.
• Add an integration test scenario that patches only metadata (labels) and asserts omitted spec fields remain intact.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
operator-framework/src/test/java/io/javaoperatorsdk/operator/baseapi/resourceoperations/ResourceOperationsReconciler.java	Adds a new operation that performs a metadata-only merge patch using a partial resource.
operator-framework/src/test/java/io/javaoperatorsdk/operator/baseapi/resourceoperations/ResourceOperationsIT.java	Adds IT coverage ensuring partial merge patches don’t delete omitted fields like spec.
operator-framework-core/src/test/java/io/javaoperatorsdk/operator/api/reconciler/ResourceOperationsTest.java	Strengthens unit assertions around merge patch behavior and patch type selection.
operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/reconciler/ResourceOperations.java	Switches merge patch calls to use explicit JSON merge patch type via PatchContext.