DAOS-13393 gurt: Add thread local setting to fault injection. (#12274)

Allow faults to be enabled/disabled on a per thread basis.
This paves the way for running better fault injection testing
on asynchronous operations where they are submitted and
completed on different threads.

Re-format the fault inject code and remove a header file.

Signed-off-by: Ashley Pittman <ashley.m.pittman@intel.com>