Evo: ignore stale block tip notifications

[navidR]

Ignore delayed deterministic-masternode tip notifications when their block is no longer the active chain tip. Add regressions covering stale callbacks and valid pure-disconnect updates after repeated invalidations.

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[reubenyap]

Reviewed the current draft head. I traced queued tip notifications through the deterministic-masternode manager, checked every tipIndex reader, and verified the cs_main-to-manager lock order against block processing. The stale callback is rejected while current and null-tip updates still work, and the full CI matrix is green. I found no actionable issues.