Add support for Native Image JFR on Windows

[roberttoyonaga]

Summary

This PR adds a Windows implementation for RawFileOperationSupport and enables JFR on Windows. New tests in RawFileOperationSupportTest have been added.

Related issue: #13184

More Details

• WindowsRawFileOperationSupport allows JFR to write to chunk files. This is the main component that was missing and blocking Windows support.
• JFR execution sampling relies on POSIX signals. This remains unsupported. I think this is fine for now and can be implemented at a later date.
• The recently integrated JFR emergency dump feature also relies on some POSIX dependent code and remains unimplemented on Windows for now. The JFR emergency dump tests have been disabled on Windows.

[roberttoyonaga]

The gate test /substratevm build,helloworld,native_unittests,standalone_pointsto_unittests JDKlatest is failing. It appears to be related to espresso, not the changes in this PR.

The espresso-compiler-stub suite is required for standalone pointsto tests.
Use `mx --dy /espresso-compiler-stub standalone-pointsto-unittest espresso`.
gate: 15 Apr 2026 14:08:28(+16:16) END:   standalone pointsto unittests [0:00:00.000657] [disk (free/total): 80.4GB/145.2GB]

I was unable to reproduce the problem on my machine with: mx --tools-java-home= gate --strict-mode --tags build,helloworld,native_unittests,standalone_pointsto_unittests

[thomaswue]

This looks good to me and I do have the tests green. I will check if I can fix that failing GitHub action gate check, which seems a configuration/test issue.

[thomaswue]

FYI, I am fixing up the wrongly wired GitHub action gate at #13349