CI: add support to skip testing selectively on full builds

This adds the ability to selectively skip the tests for various pieces
(e.g. foundation or xctest) to give us better control for CI for some
projects.

Author: compnerd

utils/build-windows-toolchain.bat

@@ -709,14 +709,25 @@ move %PackageRoot%\installer\installer.exe %BuildRoot%\artifacts || (exit /b)
 
 :: TODO(compnerd) test LLVM
 
+SET SKIP_TEST=0
+FOR %%T IN (%SKIP_TESTS%) DO (IF /I %%T==swift SET SKIP_TEST=1)
+IF "%SKIP_TEST%"=="1" (
 :: Test Swift
 :: TODO(compnerd) make lit adjust the path properly
 path %BuildRoot%\3;%BuildRoot%\1\bin;%PATH%;%SystemDrive%\Program Files\Git\usr\bin
 cmake --build %BuildRoot%\1 --target check-swift || (exit /b)
+)
 
+SET SKIP_TEST=0
+FOR %%T IN (%SKIP_TESTS%) DO (IF /I %T==dispatch SET SKIP_TEST=1)
+IF "%SKIP_TEST%"=="1"(
 :: Test dispatch
 cmake --build %BuildRoot%\3 --target ExperimentalTest || (exit /b)
+)
 
+SET SKIP_TEST=0
+FOR %%T IN (%SKIP_TESTS%) DO (IF /I %T==foundation SET SKIP_TEST=1)
+IF "%SKIP_TEST%"=="1" (
 :: NOTE(compnerd) update the path *before* the build because the tests are
 :: executed to shard the test suite.
 path %BuildRoot%\5;%BuildRoot%\4\bin;%PATH%
@@ -759,7 +770,11 @@ cmake --build %BuildRoot%\4 || (exit /b)
 :: Test Foundation
 set CTEST_OUTPUT_ON_FAILURE=1
 cmake --build %BuildRoot%\4 --target test || (exit /b)
+)
 
+SET SKIP_TEST=0
+FOR %%T IN (%SKIP_TESTS%) DO (IF /I %T==xctest SET SKIP_TEST=1)
+IF "%SKIP_TEST%"=="1" (
 :: Rebuild XCTest (w/ testing)
 cmake ^
   -B %BuildRoot%\5 ^
@@ -790,6 +805,7 @@ cmake --build %BuildRoot%\5 || (exit /b)
 
 :: Test XCTest
 cmake --build %BuildRoot%\5 --target check-xctest || (exit /b)
+)
 
 :: Clean up the module cache
 rd /s /q %LocalAppData%\clang\ModuleCache