[K/N][test] Implement shared test execution of TestCases

Added the ability to execute multiple tests once and share the results.
With Test runner turned on tests are being compiled into the single
executable. Then they executed each one separately using --ktest_*
options. This commit makes test run executable once and the result goes
to the result handler.

repo/gradle-build-conventions/buildsrc-compat/src/main/kotlin/nativeTest.kt

@@ -27,6 +27,7 @@ private enum class TestProperty(shortName: String) {
     CACHE_MODE("cacheMode"),
     EXECUTION_TIMEOUT("executionTimeout"),
     SANITIZER("sanitizer"),
+    SHARED_TEST_EXECUTION("sharedTestExecution"),
     TEAMCITY("teamcity");
 
     val fullName = "kotlin.internal.native.test.$shortName"
@@ -195,6 +196,7 @@ fun Project.nativeTest(
             compute(CACHE_MODE)
             compute(EXECUTION_TIMEOUT)
             compute(SANITIZER)
+            compute(SHARED_TEST_EXECUTION)
 
             // Pass whether tests are running at TeamCity.
             computePrivate(TEAMCITY) { kotlinBuildProperties.isTeamcityBuild.toString() }