[monodroid] remove monodroid_get_log_categories()

[jonathanpeppers]

In a NativeAOT context, we don't have libmonodroid.so at all.
Let's remove the monodroid_get_log_categories() function, as we
already pass in args->logCategories at startup. We can use a new
Logger.SetLogCategories() method to pass the value in.

I also removed JNIEnvInit.LogAssemblyCategory, as we can just use
the Logger class instead.

The startup sequence in C++ seems OK, so doesn't seem like this
changes any behavior:

• Java_mono_android_Runtime_initInternal() sets up logging
  categories very early in startup.

• create_and_initialize_domain() calls...

• init_android_runtime() calls...

• Calls managed code, JNIEnvInit.Initialize() using the correct
  logging categories.

[jonathanpeppers]

/azp run

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Copilot reviewed 5 out of 9 changed files in this pull request and generated no comments.

Files not reviewed (4)

• src/native/monodroid/internal-pinvokes.cc: Language not supported
• src/native/pinvoke-override/generate-pinvoke-tables.cc: Language not supported
• src/native/pinvoke-override/pinvoke-tables.include: Language not supported
• src/native/runtime-base/internal-pinvokes.hh: Language not supported

Comments suppressed due to low confidence (4)

src/Mono.Android/Android.Runtime/JNINativeWrapper.cs:43

• [nitpick] The name 'LogAssembly' could be more descriptive. Consider renaming it to something like 'IsAssemblyLoggingEnabled' for better clarity.

if (Logger.LogAssembly)

src/Mono.Android/Java.Interop/TypeManager.cs:227

• The condition Logger.LogAssembly is used without ensuring that Logger is properly initialized. Ensure that Logger.SetLogCategories is called before this condition.

if (Logger.LogAssembly)

src/Mono.Android/Android.Runtime/JNIEnv.cs:518

• The condition Logger.LogAssembly may not accurately reflect the logging category state if it is not properly initialized. Ensure that Logger.SetLogCategories is called before this check.

if (Logger.LogAssembly) {

src/Mono.Android/Android.Runtime/JNIEnvInit.cs:85

• The cast to LogCategories should be verified to ensure that args->logCategories is a valid value. Consider adding a validation check or handling invalid values appropriately.

Logger.SetLogCategories ((LogCategories)args->logCategories);