[TrimmableTypeMap] Add GetStaticMethodFallbackTypesCore override for desugared default interface methods

[Copilot]

Adds GetStaticMethodFallbackTypesCore override to TrimmableTypeMapTypeManager to support Java 8+ default interface methods desugared by D8/R8.

Problem

TrimmableTypeMapTypeManager did not override GetStaticMethodFallbackTypesCore(). Without this, calls to desugared default interface methods fail with NoSuchMethodError at runtime when using the trimmable type map. This affects any app using Java libraries with default interface methods (Java 8+ feature, very common in modern Android libraries like AndroidX).

Fix

Added the same override that already exists in ManagedTypeManager to TrimmableTypeMapTypeManager:

protected override IReadOnlyList<string>? GetStaticMethodFallbackTypesCore(string jniSimpleReference)
{
    int slash = jniSimpleReference.LastIndexOf('/');
    var desugarType = slash > 0
        ? $"{jniSimpleReference.Substring(0, slash + 1)}Desugar{jniSimpleReference.Substring(slash + 1)}"
        : $"Desugar{jniSimpleReference}";
    return new[] {
        $"{desugarType}$_CC",
        $"{jniSimpleReference}$-CC",
    };
}

This generates two fallback type names for desugared companion classes (Desugar{Type}$_CC and {Type}$-CC) so that JNI static method lookups on desugared default interface methods succeed at runtime.

[simonrozsival]

@copilot continue

[Copilot]

@copilot continue

Added the GetStaticMethodFallbackTypesCore override to TrimmableTypeMapTypeManager in c0a25a0. The implementation is a direct copy from ManagedTypeManager, generating the two desugar fallback type names (Desugar...$_CC and ...$-CC) needed for D8/R8-desugared default interface methods.