refactor(target): Reduce cgroup discovery stat overhead#185
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Use `FTS_NOSTAT` during cgroup discovery and replace the stat-based leaf check with FTS pre/post-order tracking. This preserves leaf-only target discovery while avoiding per-entry stat calls in the traversal hot path.
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This PR improves the cgroup discovery method by removing the reliance on the very costly
fts_statpmetadata.The (mostly unused) target type filter have also been removed from the discovery codepath.