fix: suppress ILLink trimmer warnings across osu.Game and osu.Desktop #2639

Job	Run time
Code Quality	6m 38s
Build only (iOS)	6m 38s
Build only (Android)	13m 36s
Test (Windows, windows-2025-vs2026, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debu...	13m 55s
Test (Windows, windows-2025-vs2026, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tes...	39m 53s
Test (Linux, ubuntu-latest, MultiThreaded, game, osu.Game.Tests/bin/Debug/**/osu.Game.Tests.dll o...	31m 39s
Test (Linux, ubuntu-latest, MultiThreaded, rulesets, osu.Game.Rulesets.Osu.Tests/bin/Debug/**/osu...	11m 1s
Resource Budget (Source Overrides)	37s
Test results	13s
	2h 4m 10s

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