CMake: Use build environment prefix.bat when running tests

Tests like tst_qmake need the build environment to be able to build
apps / libraries. This is mostly needed for MSVC.

Set the TESTS_ENV_PREFIX env var to point to the proper prefix.bat
(host or target) and use that when running ctest.

Task-number: QTBUG-85240
Task-number: QTBUG-78449
Task-number: QTBUG-81365
Change-Id: I6fa68714202ac7fc703973fc772e03b84790a043
Reviewed-by: Cristian Adam <cristian.adam@qt.io>

coin/instructions/cmake_regular_test_instructions.yaml

@@ -12,7 +12,7 @@ instructions:
   - type: ChangeDirectory
     directory: "{{.SourceDir}}_standalone_tests"
   - type: ExecuteCommand
-    command: "ctest -V --rerun-failed"
+    command: "{{.Env.TESTS_ENV_PREFIX}} ctest -V --rerun-failed"
     ignoreExitCode: true
     maxTimeInSeconds: 7200
     maxTimeBetweenOutput: 900

coin/instructions/cmake_setup_running_tests_env_vars.yaml

@@ -0,0 +1,30 @@
+type: Group
+instructions:
+  - type: Group
+    instructions:
+      - type: EnvironmentVariable
+        variableName: TESTS_ENV_PREFIX
+        variableValue: "{{.Env.ENV_PREFIX}}"
+    enable_if:
+      condition: and
+      conditions:
+        - condition: property
+          property: host.os
+          equals_property: target.os
+        - condition: property
+          property: target.osVersion
+          not_equals_value: QEMU
+  - type: Group
+    instructions:
+      - type: EnvironmentVariable
+        variableName: TESTS_ENV_PREFIX
+        variableValue: "{{.Env.TARGET_ENV_PREFIX}}"
+    disable_if:
+      condition: and
+      conditions:
+        - condition: property
+          property: host.os
+          equals_property: target.os
+        - condition: property
+          property: target.osVersion
+          not_equals_value: QEMU

coin/instructions/coin_module_test_template_v2.yaml

@@ -2,6 +2,10 @@ type: Group
 instructions:
   - type: Group
     instructions:
+      # The build env is needed on MSVC so that tst_qmake can properly build apps / libraries.
+      - !include "{{qt/qtbase}}/prepare_building_env.yaml"
+      # The test env vars are needed to pick the proper prefix.bat file.
+      - !include "{{qt/qtbase}}/cmake_setup_running_tests_env_vars.yaml"
       - !include "{{qt/qtbase}}/coin_module_test_qemu_env_vars.yaml"
       - type: Group
         instructions: