[#24574] Disable file watching on macOS and remove invalid InternalPtrData move

[Danipiza]

Description

This PR improves native macOS compatibility in cpp_utils.

Changes

• Disable FileWatcher on macOS by using a no-op backend under __APPLE__.
• Keep FileWatcherHandler behavior explicit by logging that file watching is disabled on macOS.
• Remove the InternalPtrData move constructor, which attempted to move a std::shared_timed_mutex.

Why

The bundled filewatch backend only supports Windows and Linux (inotify), so native macOS builds had no valid code path.

Also, InternalPtrData tried to move a mutex:

• std::shared_timed_mutex is not movable by standard definition
• Apple Clang/libc++ correctly rejects this
• removing the move constructor makes the type standards-compliant

Error

Starting >>> cpp_utils
--- stderr: cpp_utils                             
In file included from /Users/macmini/workspace_dev_utils/src/dev-utils/cpp_utils/src/cpp/event/FileWatcherHandler.cpp:25:
In file included from /Users/macmini/workspace_dev_utils/src/dev-utils/cpp_utils/src/cpp/event/FileWatcher.hpp:21:
/Users/macmini/workspace_dev_utils/src/dev-utils/cpp_utils/../thirdparty/filewatch/FileWatch.hpp:98:11: error: initializer '_directory' does not name a non-static data member or base class; did you mean the member '_destory'?
   98 |         , _directory(get_directory(path))
      |           ^~~~~~~~~~
      |           _destory
/Users/macmini/workspace_dev_utils/src/dev-utils/cpp_utils/../thirdparty/filewatch/FileWatch.hpp:171:23: note: '_destory' declared here
  171 |     std::atomic<bool> _destory = { false };
      |                       ^
/Users/macmini/workspace_dev_utils/src/dev-utils/cpp_utils/../thirdparty/filewatch/FileWatch.hpp:132:9: error: use of undeclared identifier '_directory'; did you mean '_destory'?
  132 |         _directory = get_directory(other._path);
      |         ^~~~~~~~~~
      |         _destory
/Users/macmini/workspace_dev_utils/src/dev-utils/cpp_utils/../thirdparty/filewatch/FileWatch.hpp:171:23: note: '_destory' declared here
  171 |     std::atomic<bool> _destory = { false };
      |                       ^
/Users/macmini/workspace_dev_utils/src/dev-utils/cpp_utils/../thirdparty/filewatch/FileWatch.hpp:249:33: error: use of undeclared identifier 'monitor_directory'
  249 |                                 monitor_directory();
      |                                 ^
/Users/macmini/workspace_dev_utils/src/dev-utils/cpp_utils/../thirdparty/filewatch/FileWatch.hpp:98:22: error: use of undeclared identifier 'get_directory'
   98 |         , _directory(get_directory(path))
      |                      ^
/Users/macmini/workspace_dev_utils/src/dev-utils/cpp_utils/../thirdparty/filewatch/FileWatch.hpp:106:11: note: in instantiation of member function 'filewatch::FileWatch<std::string>::FileWatch' requested here
  106 |         : FileWatch<T>(path, UnderpinningRegex(_regex_all), callback)
      |           ^
/Library/Developer/CommandLineTools/usr/bin/../include/c++/v1/__memory/unique_ptr.h:728:32: note: in instantiation of member function 'filewatch::FileWatch<std::string>::FileWatch' requested here
  728 |     return unique_ptr<_Tp>(new _Tp(_VSTD::forward<_Args>(__args)...));
      |                                ^
/Users/macmini/workspace_dev_utils/src/dev-utils/cpp_utils/src/cpp/event/FileWatcherHandler.cpp:61:36: note: in instantiation of function template specialization 'std::make_unique<eprosima::utils::event::FileWatcher, std::string &, (lambda at /Users/macmini/workspace_dev_utils/src/dev-utils/cpp_utils/src/cpp/event/FileWatcherHandler.cpp:63:13)>' requested here
   61 |         file_watch_handler_ = std::make_unique<FileWatcher>(
      |                                    ^
4 errors generated.
make[2]: *** [CMakeFiles/cpp_utils.dir/src/cpp/event/FileWatcherHandler.cpp.o] Error 1
make[2]: *** Waiting for unfinished jobs....
make[1]: *** [CMakeFiles/cpp_utils.dir/all] Error 2
make: *** [all] Error 2
---
Failed   <<< cpp_utils [1.54s, exited with code 2]

Summary: 5 packages finished [3.30s]
  1 package failed: cpp_utils
  3 packages had stderr output: cpp_utils fastcdr fastdds

[codecov-commenter]

Codecov Report

❌ Patch coverage is 0% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 60.30%. Comparing base (6031d4e) to head (6669e32).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
cpp_utils/src/cpp/event/FileWatcherHandler.cpp	0.00%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #157      +/-   ##
==========================================
- Coverage   60.41%   60.30%   -0.11%     
==========================================
  Files          65       65              
  Lines        1945     1945              
  Branches      552      552              
==========================================
- Hits         1175     1173       -2     
- Misses        449      450       +1     
- Partials      321      322       +1     

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