refactor: call existing helpers instead of re-implementing them

[csviri]

No behavior change; each site is replaced by a helper that already exists.

• PrimaryUpdateAndCacheUtils#compareResourceVersions (and its private
  validateResourceVersion) duplicated the entire algorithm of
  ReconcilerUtilsInternal#validateAndCompareResourceVersions: the length-first
  compare, the empty check, the leading-zero check and the same exception
  messages. It had no production caller, so the copy could silently drift from
  the version all production paths use. Delegate instead.
• addFinalizerWithSSA builds its bare SSA skeleton with
  HasMetadata#initNameAndNamespaceFrom, which ResourceOperations already uses
  for the same purpose and which is Namespaced-aware.
• AbstractInformerPool formats the informer identifier with
  ReconcilerUtilsInternal#getResourceTypeNameWithVersion instead of
  concatenating the resource name and version by hand.
• EventFilterWindow uses ExtendedResourceEvent#getResourceVersion, which had
  no callers even though it is exactly the expression used here.
• LocallyRunOperatorExtension instantiates reconcilers with Utils#instantiate,
  so it also supports non-public no-arg constructors and reports the failing
  class instead of wrapping in a bare RuntimeException.

---

Quality-only change: no intended behavior difference. Cut from next and
touches a disjoint set of files from the sibling cleanup PRs, so it can be merged
independently and in any order.

Verified on this branch alone: mvn -o -pl operator-framework-core,operator-framework-junit -am test
(693 core + 6 junit tests, no failures) and mvn spotless:check.

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[Copilot]

Pull request overview

Refactors several call sites in the Java Operator SDK to delegate to existing helper methods instead of duplicating logic, aiming to reduce drift risk and keep behavior consistent across the codebase.

Changes:

• Delegate resourceVersion validation/comparison to ReconcilerUtilsInternal.validateAndCompareResourceVersions(...) instead of maintaining a duplicate implementation.
• Use shared helper methods for common formatting / metadata initialization (getResourceTypeNameWithVersion, initNameAndNamespaceFrom, ExtendedResourceEvent#getResourceVersion).
• Instantiate reconcilers in LocallyRunOperatorExtension via Utils.instantiate(...) to match core instantiation behavior and improve error reporting.

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
operator-framework-junit/src/main/java/io/javaoperatorsdk/operator/junit/LocallyRunOperatorExtension.java	Switch reconciler instantiation to Utils.instantiate for consistent reflective construction and better error reporting.
operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/source/informer/pool/AbstractInformerPool.java	Use ReconcilerUtilsInternal.getResourceTypeNameWithVersion for consistent informer identification formatting.
operator-framework-core/src/main/java/io/javaoperatorsdk/operator/processing/event/source/informer/EventFilterWindow.java	Replace inline resourceVersion extraction/parsing with ExtendedResourceEvent#getResourceVersion().
operator-framework-core/src/main/java/io/javaoperatorsdk/operator/api/reconciler/PrimaryUpdateAndCacheUtils.java	Replace duplicated resourceVersion comparison logic with delegation, and use initNameAndNamespaceFrom for SSA skeleton metadata.