Actions test plan from
https://github.com/KhronosGroup/OpenCL-CTS/issues/2473 to update CTS
tests to reflect changes from cl_khr_command_buffer PR
https://github.com/KhronosGroup/OpenCL-Docs/pull/1411
* Adds new test in`command_buffer_pipelined_enqueue.cpp` for multiple
enqueues without blocking in-between, but serialized execution.
* Removed test for `CL_COMMAND_BUFFER_STATE_PENDING_KHR` state query.
* Remove negative test for `clEnqueueCommandBuffer` pending state error.
* Simplify `cl_khr_command_buffer` tests that stress simultaneous-use by
testing multiple serialized enqueues of the same command-buffer, which
doesn't now require the device imultaneous-use capability
* Remove simultaneous-use command-buffer creation in base class to off,
and require tests do it themselves if they require it.
* Rewrite mutable dispatch simultaneous test to test updating both
pipelined enqueues, and updating the new definition of simultaneous-use
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Co-authored-by: Ewan Crawford <ewan@codeplay.com>
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