Suppress IL3000 in MsQuicApi constructor (#109965)

A call to `Assembly.Location` was added in a recent fix. It has `IL30000` suppressed via `#pragma warning disable`, but that only applies to the compilation of the library itself. Consumers will hit it when doing something like publishing their app as NativeAOT.

This change adds an `[UnconditionalSuppressMessage]` to the `MsQuicApi` static constructor such that `IL30000` should also be suppressed for apps consuming the runtime.

This was caught in an aspnetcore deps flow PR coming from runtime.

Co-authored-by: Elinor Fung <[email protected]>

src/libraries/System.Net.Quic/src/System/Net/Quic/Internal/MsQuicApi.cs

@@ -65,6 +65,8 @@ private MsQuicApi(QUIC_API_TABLE* apiTable)
     internal static bool Tls13ClientMayBeDisabled { get; }
 
 #pragma warning disable CA1810 // Initialize all static fields in 'MsQuicApi' when those fields are declared and remove the explicit static constructor
+    [UnconditionalSuppressMessage("SingleFile", "IL3000: Avoid accessing Assembly file path when publishing as a single file",
+        Justification = "The code handles the Assembly.Location being null/empty by falling back to AppContext.BaseDirectory")]
     static MsQuicApi()
     {
         bool loaded = false;