perf: size the workflow result map from Workflow#size

[csviri]

AbstractWorkflowExecutor called Workflow#getDependentResourcesByName purely to
read its size. That allocates a HashMap and walks every node to collect the
dependent resources, then discards the map. The executor is constructed on
every reconcile and cleanup of a workflow-based reconciler, so use the existing
Workflow#size instead.

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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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Pull request overview

This PR reduces per-reconcile allocation overhead in the workflow execution path by avoiding creation of a dependent-resources map solely to pre-size the executor’s result map. It leverages DefaultWorkflow#size() (which is backed by dependentResourceNodes.size()) to keep behavior unchanged while eliminating unnecessary work.

Changes:

• Replace workflow.getDependentResourcesByName().size() with workflow.size() when initializing results in AbstractWorkflowExecutor.
• Avoid allocating and populating a temporary HashMap of dependent resources during executor construction.