Add test for parsing interfaces with deprecated attributes (#55771)

Summary:

Adding tests for parsing interfaces with deprecated attributes and extending the doxygen test config with `__attribute__` predefined macro.

## Changelog:
[Internal]

Reviewed By: cipolleschi

Differential Revision: D94343118

Author: coado

scripts/cxx-api/tests/snapshots/.doxygen.config.template

@@ -2442,7 +2442,7 @@ INCLUDE_FILE_PATTERNS  =
 # recursively expanded use the := operator instead of the = operator.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-PREDEFINED             =
+PREDEFINED             = FOLLY_PACK_PUSH="" FOLLY_PACK_POP="" FOLLY_PACK_ATTR="" __attribute__(x)=""
 
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
 # tag can be used to specify a list of macro names that should be expanded. The

scripts/cxx-api/tests/snapshots/should_handle_method_with_attribute/snapshot.api

@@ -0,0 +1,4 @@
+interface RCTTestInterface {
+  public virtual NSArray * interfaceDeprecatedMethod:(id param);
+  public virtual void normalMethod:(NSString * name);
+}

scripts/cxx-api/tests/snapshots/should_handle_method_with_attribute/test.h

@@ -0,0 +1,14 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+@interface RCTTestInterface
+
+- (void)normalMethod:(NSString *)name;
+
+- (NSArray *)interfaceDeprecatedMethod:(id)param __attribute__((deprecated("This method is deprecated.")));
+
+@end