EXSWCPHIPT-42: Changes to HIP RTC Framework implementation (#2732)

- Removed ifdef from hipTestContext class
- Fix potential race condition in hipTest::launchRTCKernel()
- Improve documentation
- Move moduleUnloading to main() instead of explicitly calling it on every test
- Fix code formating
- Fix segmentation fault caused by using catch2 macro after catch2 is destroyed

[ROCm/hip-tests commit: a0296bd614]

projects/hip-tests/catch/unit/memory/hipHostMalloc.cc

@@ -144,7 +144,6 @@ TEST_CASE("Unit_hipHostMalloc_Basic") {
     HIP_CHECK(hipHostFree(A_h));
     HIP_CHECK(hipHostFree(B_h));
     HIP_CHECK(hipHostFree(C_h));
-    TestContext::get().cleanContext();
   }
 }
 /*
@@ -182,7 +181,6 @@ TEST_CASE("Unit_hipHostMalloc_NonCoherent") {
                    SYNC_STREAM, ptrType);
   CheckHostPointer(numElements, A, hipEventReleaseToSystem,
                    SYNC_EVENT, ptrType);
-  TestContext::get().cleanContext();
 }
 
 /*