Skip ActiveSupport deprecation proxies when gathering DSL constants

[Hashim1999164]

Fixes #2463

Rails 8.1 replaced LoadInterlockAwareMonitor with a DeprecatedConstantProxy. DSL compilers walk every loaded module and call methods such as singleton_class on each one. Those calls go through method_missing on the proxy and print deprecation warnings even though Tapioca is only enumerating ObjectSpace.

This change drops DeprecatedConstantProxy modules from all_modules so every DSL compiler skips them. Kernel.class is used to recognize the proxy without triggering the warning.

The ActiveSupportConcern gather_constants spec covers the Rails 8.1 LoadInterlockAwareMonitor proxy.

[KaanOzkan]

Thank you for the fix. Minor suggestions.

[KaanOzkan]

I didn't dive into it but agent suggested this diff instead and claimed that current refute_includes would pass even without this change because the name is delegated and becomes Monitor, it might be better to do the diff below. Also can you ensure the final test fails without your change?

- constants = gathered_constants
+ proxy = ActiveSupport::Concurrency.const_get(:LoadInterlockAwareMonitor, false)
+ gathered_constants
+ all_modules = Tapioca::Dsl::Compilers::ActiveSupportConcern.send(:all_modules)
...
- refute_includes(constants, "ActiveSupport::Concurrency::LoadInterlockAwareMonitor")
+ refute(all_modules.any? { |mod| Tapioca::Runtime::Reflection.are_equal?(mod, proxy) })
  assert_empty(warnings.grep(/LoadInterlockAwareMonitor/))

[KaanOzkan]

I think it's better to abide by the requested constants even if they result in warnings. Can you move this reject above?

ObjectSpace.each_object(Module).reject { |mod| deprecated_constant_proxy?(mod) }