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

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