Introduce UseToolchainFromTargetDir feature for tests that are built at test stage

The feature allows controlling which toolchain should be used when
building tests. Since WoA supposed to build tests using the
crosscompiled Qt in native host environment, this option allows
preparing the correct build environment and use the crosscompiled
'target' Qt.

Drive-by change the way prefix.bat is called for native WoA configuration.

Pick-to: 6.10
Change-Id: Ifec7593b4216ee2e2ffe185ae0dc0559d501762b
Reviewed-by: Alexandru Croitor <alexandru.croitor@qt.io>

coin/instructions/cmake_build_tests_in_test_stage.yaml

@@ -8,16 +8,26 @@ instructions:
     instructions:
       - !include "{{qt/qtbase}}/cmake_build_and_upload_test_artifacts_host.yaml"
     disable_if:
-      condition: property
-      property: target.osVersion
-      in_values: [Android_ANY, QEMU, IOS_ANY, QNX_710, WebAssembly, INTEGRITY, VxWorks]
+      condition: or
+      conditions:
+        - condition: property
+          property: target.osVersion
+          in_values: [Android_ANY, QEMU, IOS_ANY, QNX_710, WebAssembly, INTEGRITY, VxWorks]
+        - condition: property
+          property: features
+          contains_value: UseToolchainFromTargetDir
   - type: Group
     instructions:
       - !include "{{qt/qtbase}}/cmake_build_and_upload_test_artifacts_target.yaml"
     enable_if:
-      condition: property
-      property: target.osVersion
-      in_values: [Android_ANY, QEMU, IOS_ANY, QNX_710, WebAssembly, INTEGRITY, VxWorks]
+      condition: or
+      conditions:
+        - condition: property
+          property: target.osVersion
+          in_values: [Android_ANY, QEMU, IOS_ANY, QNX_710, WebAssembly, INTEGRITY, VxWorks]
+        - condition: property
+          property: features
+          contains_value: UseToolchainFromTargetDir
 enable_if:
   condition: property
   property: features

coin/instructions/prepare_building_env.yaml

@@ -202,8 +202,8 @@ instructions:
               property: target.arch
               in_values: ["AARCH64", "ARM64"]
             - condition: property
-              property: host
-              equals_property: target
+              property: host.arch
+              in_values: ["AARCH64", "ARM64"]
       - type: EnvironmentVariable
         # HACK. Overwrite TARGET_ARCHITECTURE as we do not use standard MSVC cross
         # compilation targets here. The target architecture will be detected by Qt.
@@ -398,11 +398,11 @@ instructions:
       condition: and
       conditions:
         - condition: property
-          property: target.os
+          property: host.os
           equals_value: Windows
         - condition: property
-          property: target.arch
-          not_equals_property: host.arch
+          property: host.compiler
+          contains_value: MSVC
     instructions:
       - type: EnvironmentVariable
         variableName: TARGET_ENV_PREFIX