Hennadii Stepanov 3bb30658e6
Merge bitcoin/bitcoin#32380: Modernize use of UTF-8 in Windows code
53e4951a5b5b9d166d278db4240513d09b447f58 Switch to ANSI Windows API in `fsbridge::fopen()` function (Hennadii Stepanov)
dbe770d9210666a366f055d52b9f34fa8a3d7305 Switch to ANSI Windows API in `Win32ErrorString()` function (Hennadii Stepanov)
06d0be4e22cef08fd7517f42ee82a44475c6363b Remove no longer necessary `WinCmdLineArgs` class (Hennadii Stepanov)
f366408492f6205ee20fe23e5104813de45dd4b1 cmake: Set process code page to UTF-8 on Windows (Hennadii Stepanov)
dccbb178065f05810a0fad57a86bca2f10995ecf Set minimum supported Windows version to 1903 (May 2019 Update) (Hennadii Stepanov)

Pull request description:

  The main goal is to remove [deprecated](https://github.com/bitcoin/bitcoin/issues/32361) code (removed in C++26).

  This PR employs Microsoft's modern [approach](https://learn.microsoft.com/en-us/windows/apps/design/globalizing/use-utf8-code-page) to handling UTF-8:
  > Until recently, Windows has emphasized "Unicode" -W variants over -A APIs. However, recent releases have used the ANSI code page and -A APIs as a means to introduce UTF-8 support to apps. If the ANSI code page is configured for UTF-8, then -A APIs typically operate in UTF-8. This model has the benefit of supporting existing code built with -A APIs without any code changes.

  TODO:
  - [x] Handle application manifests properly when building with MSVC.
  - [x] Bump the minimum supported Windows version to 1903 (May 2019 Update).
  - [x] Remove all remaining use cases of the deprecated `std:wstring_convert`.
      - The instance in `subprocess.h` will be addressed in a follow-up PR, as additional tests are likely needed.
      - The usage in `common/system.cpp` is handled in https://github.com/bitcoin/bitcoin/pull/32566.

  Resolves partially https://github.com/bitcoin/bitcoin/issues/32361.

ACKs for top commit:
  laanwj:
    re-ACK 53e4951a5b5b9d166d278db4240513d09b447f58
  hodlinator:
    re-ACK 53e4951a5b5b9d166d278db4240513d09b447f58
  davidgumberg:
    untested crACK 53e4951a5b

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