[release-1.14] Stabilize predicates plugin execution order and rollback semantics

[Copilot]

Cherry-picking #5259 onto release-1.14 required manual conflict resolution in the predicates plugin. This updates plugin execution to deterministic ordering and aligns rollback behavior with reserve execution order.

• Deterministic plugin execution across predicates stages

  • Added explicit order slices to PredicatesPlugin for each stage:
    • FilterOrder, StableFilterOrder, PreFilterOrder, ReserveOrder, PreBindOrder, ScoreOrder
  • Recorded order during InitPlugin() registration via stage-specific helper adders.
  • Replaced map iteration with ordered-slice traversal in:
    • PrePredicate, Predicate (stable + non-stable filters), BatchNodeOrder, runReservePlugins, PreBind.

• Rollback semantics made symmetric with reserve path

  • Added a shared unreserve helper that iterates ReserveOrder in reverse.
  • Updated both deallocate flow (runUnReservePlugins) and PreBindRollBack to use reverse-order unreserve execution.

• Naming alignment from the follow-up patch

  • Unified exported field naming:
    • PrefilterPlugins → PreFilterPlugins

• Focused test coverage for this backport

  • Added deterministic-order regression test for predicate failure reason aggregation.
  • Added reserve/unreserve ordering test to verify reverse rollback behavior.

for i := len(pp.ReserveOrder) - 1; i >= 0; i-- {
	plugin, exists := pp.ReservePlugins[pp.ReserveOrder[i]]
	if !exists {
		continue
	}
	plugin.Unreserve(ctx, state, pod, nodeName)
}

[JesseStutler]

/approve
/lgtm

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