refactor: address code review - extract kill threshold constant and f… #2583

Job	Run time
Build only (Android)	16m 17s
Test (Linux, ubuntu-latest, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debug/**/osu...	2h 0m 16s
Test (Linux, ubuntu-latest, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tests.dll o...	2h 0m 15s
Test (Windows, windows-2025-vs2026, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debu...	2h 0m 6s
Code Quality	5m 56s
Build only (iOS)	3m 20s
Resource Budget (Source Overrides)	41s
Test (Windows, windows-2025-vs2026, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tes...	2h 0m 6s
Test results	12s
	8h 27m 9s

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