fix: suppress ILLink trim warnings in osu.Game/osu.Desktop and fix iO… #2642

Job	Run time
Resource Budget (Source Overrides)	26s
Build only (iOS)	3m 47s
Test (Windows, windows-2025-vs2026, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tes...	46m 50s
Code Quality	13m 8s
Test (Linux, ubuntu-latest, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tests.dll o...	29m 14s
Test (Linux, ubuntu-latest, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debug/**/osu...	10m 24s
Build only (Android)	43s
Test (Windows, windows-2025-vs2026, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debu...	16m 56s
Test results	17s
	2h 1m 45s

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