CI: Missing test of Vim with ConPTY on Windows

Problem:  Current CI Windows testing does not test Vim using ConPTY.

Solution: Added a configuration to enable ConPTY to the Windows matrix.
          This configuration suppresses the installation of winpty,
          allowing testing with ConPTY.

Since the fixes made at the end of last year, all tests now pass when
using ConPTY, just like when using winpty. ConPTY itself is stable on
recent versions of Windows, so there are no longer any reasons not to
test it.

closes: #19066

Signed-off-by: Muraoka Taro <koron.kaoriya@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>

Author: koron

.github/workflows/ci.yml

@@ -522,6 +522,7 @@ jobs:
           - { features: HUGE,   toolchain: mingw, VIMDLL: yes, GUI: yes, arch: x86, python3: stable, coverage: yes }
           - { features: HUGE,   toolchain: msvc,  VIMDLL: no,  GUI: yes, arch: x86 }
           - { features: HUGE,   toolchain: mingw, VIMDLL: yes, GUI: no,  arch: x64, coverage: yes }
+          - { features: HUGE,   toolchain: msvc,  VIMDLL: no,  GUI: no,  arch: x64, ttytype: conpty }
           - { features: NORMAL, toolchain: msvc,  VIMDLL: yes, GUI: no,  arch: x86 }
           - { features: NORMAL, toolchain: mingw, VIMDLL: no,  GUI: yes, arch: x64 }
           - { features: TINY,   toolchain: msvc,  VIMDLL: yes, GUI: yes, arch: x64 }
@@ -616,11 +617,13 @@ jobs:
           call :downloadfile %LUA${{ env.BITS }}_URL% downloads\lua.zip
           7z x downloads\lua.zip -o%LUA_DIR% > nul || exit 1
 
-          echo %COL_GREEN%Download winpty%COL_RESET%
-          call :downloadfile %WINPTY_URL% downloads\winpty.zip
-          7z x -y downloads\winpty.zip -oD:\winpty > nul || exit 1
-          copy /Y D:\winpty\%WARCH%\bin\winpty.dll        src\winpty%BITS%.dll
-          copy /Y D:\winpty\%WARCH%\bin\winpty-agent.exe  src\
+          if not "${{ matrix.ttytype }}" == "conpty" (
+            echo %COL_GREEN%Download winpty%COL_RESET%
+            call :downloadfile %WINPTY_URL% downloads\winpty.zip
+            7z x -y downloads\winpty.zip -oD:\winpty > nul || exit 1
+            copy /Y D:\winpty\%WARCH%\bin\winpty.dll        src\winpty%BITS%.dll
+            copy /Y D:\winpty\%WARCH%\bin\winpty-agent.exe  src\
+          )
 
           echo %COL_GREEN%Download libsodium%COL_RESET%
           if "${{ matrix.toolchain }}"=="msvc" (