fix: honour bulk dependent resource capabilities during reconciliation

[csviri]

A BulkDependentResource may implement any subset of Creator,
Updater and Deleter. BulkDependentResourceInstance, the internal
per-item wrapper that reuses AbstractDependentResource's reconcile
logic, implements all three and delegates each call to the bulk resource
with an unchecked cast. Its capabilities therefore have to be derived
from the wrapped bulk resource.

0b8d8dd introduced the overridable creatable() / updatable() hooks
for exactly this, but the wiring was never completed:

• BulkDependentResourceInstance overrides isCreatable() /
  isUpdatable(), which reconcile never consults, so both overrides
  were dead code.
• the inner create branch of AbstractDependentResource.reconcile still
  read the creatable field directly instead of calling creatable().

Since the wrapper implements all three interfaces, both fields are always
true, so create and update were attempted regardless of what the bulk
resource actually supports, failing with a ClassCastException in
BulkDependentResourceInstance.create / update:

java.lang.ClassCastException: class ...CreateAndDeleteOnlyBulk
  cannot be cast to class ...Updater
  at BulkDependentResourceInstance.update(BulkDependentResourceReconciler.java:115)
  at AbstractDependentResource.handleUpdate(AbstractDependentResource.java:204)

A non-bulk dependent in the same situation just logs "implement Updater
interface to modify it" and skips the operation.

Fixes this by overriding creatable() / updatable() in the wrapper and
by using creatable() in the create branch. isCreatable() /
isUpdatable() now delegate to creatable() / updatable() so the two
pairs cannot drift apart again.

Adds regression tests for a create+delete-only and a delete-only bulk
dependent; both fail without this change.

Part of #3517

[Copilot]

Pull request overview

Fixes reconciliation for bulk dependents so create/update operations are only attempted when the wrapped BulkDependentResource actually supports them, preventing ClassCastException from the per-item wrapper incorrectly advertising capabilities.

Changes:

• Wire AbstractDependentResource.reconcile to consult the overridable creatable() hook (not the raw creatable field) when entering the create path.
• Update BulkDependentResourceInstance to override creatable() / updatable() based on the wrapped bulk resource’s implemented capabilities.
• Add regression tests covering bulk dependents that support only (create+delete) and only (delete), ensuring create/update are skipped appropriately.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/dependent/AbstractDependentResource.java	Ensures reconciliation uses creatable()/updatable() hooks consistently so capability overrides are honored.
operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/dependent/BulkDependentResourceReconciler.java	Derives per-item wrapper create/update capabilities from the wrapped bulk resource to avoid invalid casts.
operator-framework-core/src/test/java/io/javaoperatorsdk/operator/processing/dependent/BulkDependentResourceCapabilitiesTest.java	Adds regression coverage for bulk resources that intentionally do not implement Creator and/or Updater.