build: Add missing crashpad_wer.dll to Windows build and export

[limbonaut]

Copy crashpad_wer.dll to the Windows build output directory after the build completes, and also add it to export dependencies so it's also copied during Godot export process.

• Resolves Missing crashpad_wer.dll on Windows #394

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Note

Adds crashpad_wer.dll (and PDB) to Windows build artifacts and export dependencies, copying it alongside crashpad_handler.

• Windows build/export:
  • Add crashpad_wer.dll and crashpad_wer.pdb to build targets and copy steps in modules/sentry-native.SConscript.
  • Include crashpad_wer.dll in Windows export dependencies for both x86_64 and x86_32 in src/manifest.gdextension.
• Docs:
  • Update CHANGELOG.md to note the added crashpad_wer.dll in Windows builds.

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