kokoro: remove bot config for VS 2019 (KhronosGroup#6248)

Update the README to only mention VS 2022 and not VS 2019

Bug: http://crbug.com/437082422

Author: dneto0

README.md

@@ -467,7 +467,6 @@ On MacOS
 - AppleClang 15.0
 
 On Windows
-- Visual Studio 2019
 - Visual Studio 2022
 
 Note: Other compilers or later versions may work, but they are not tested.

kokoro/scripts/windows/build.bat

@@ -27,10 +27,7 @@ set PATH=C:\python312;c:\cmake-3.31.2\bin;%PATH%
 :: #########################################
 :: set up msvc build env
 :: #########################################
-if %VS_VERSION% == 2019 (
-  call "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat" x64
-  echo "Using VS 2019..."
-) else if %VS_VERSION% == 2022 (
+if %VS_VERSION% == 2022 (
   call "C:\Program Files\Microsoft Visual Studio\2022\Professional\VC\Auxiliary\Build\vcvarsall.bat" x64
   echo "Using VS 2022..."
 )

kokoro/windows-msvc-2019-release/build.bat

@@ -20,4 +20,4 @@
 set SCRIPT_DIR=%~dp0
 
 :: Call with correct parameter
-call %SCRIPT_DIR%\..\scripts\windows\build.bat Debug 2019
+call %SCRIPT_DIR%\..\scripts\windows\build.bat Debug 2022