Tests: run suites instead of individual test cases

Group all tests of a test suite into a single test command invocation.
This reduces the number of invocations by `ctest` by an order of
magnitude.

Since rB56aa5b0d8c6b663, `bin/tests/blender_test` was run for every
individual test. Having over a 1000 tests made testing slower than
necessary. Individual tests can still be run if desired by invocation of
`bin/tests/blender_test --gtest_filter=suitename.testname`.

NOTE: For this commit to have an immediate effect, it may be necessary
to remove the `tests` and `Testing` directories and some CMake files
from your build directory and rebuild. Run `ctest -N` to see the list of
tests; there should be less than 200.

Reviewed By: sergey, LazyDodo, sebbas

Maniphest Tasks: T83222

Differential Revision: https://developer.blender.org/D9649

CMakeLists.txt

@@ -1773,6 +1773,10 @@ elseif(WITH_CYCLES_STANDALONE)
   endif()
 endif()
 
+#-----------------------------------------------------------------------------
+# Testing
+add_subdirectory(tests)
+
 #-----------------------------------------------------------------------------
 # Blender Application
 if(WITH_BLENDER)
@@ -1780,11 +1784,6 @@ if(WITH_BLENDER)
 endif()
 
 
-#-----------------------------------------------------------------------------
-# Testing
-add_subdirectory(tests)
-
-
 #-----------------------------------------------------------------------------
 # Define 'heavy' submodules (for Ninja builder when using pools).
 setup_heavy_lib_pool()