Use NativeAOT findvcvarsall to find mscv toolchain

[am11]

Related to dotnet/runtime#127414

Switches to use https://github.com/dotnet/runtime/blob/a8f71804178cb4fecd150e45082359dd11d71a76/src/coreclr/nativeaot/BuildIntegration/findvcvarsall.bat with minor difference that we need to capture more than just the compiler path:

% diff -U2 ../runtime/src/coreclr/nativeaot/BuildIntegration/findvcvarsall.bat src/msbuild/findvcvarsall.bat
--- ../runtime/src/coreclr/nativeaot/BuildIntegration/findvcvarsall.bat
+++ src/msbuild/findvcvarsall.bat
@@ -33,14 +33,18 @@
 CALL "%vsBase%\vc\Auxiliary\Build\vcvarsall.bat" %vcEnvironment% > NUL 2> NUL

+IF "%LIB%"=="" GOTO :ERROR
+IF "%INCLUDE%"=="" GOTO :ERROR
+
 FOR /F "delims=" %%W IN ('where link') DO (
-    FOR %%A IN ("%%W") DO ECHO %%~dpA#
-    GOTO :CAPTURE_LIB_PATHS
+    FOR %%A IN ("%%W") DO SET "linkPath=%%~dpA"
+    GOTO :SUCCESS
 )

 GOTO :ERROR

-:CAPTURE_LIB_PATHS
-IF "%LIB%"=="" GOTO :ERROR
-ECHO %LIB%
+:SUCCESS
+
+IF "%linkPath%"=="" GOTO :ERROR
+ECHO %vsBase%#%linkPath%#%LIB%#%INCLUDE%

 ENDLOCAL

Replaces the old VisualStudio.Setup based implementation.

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