added diagnostic_interval int for nonlinear solver diagnostic. #22976

Job	Run time
GCC 3D & RZ w/ MPI, single precision	23m 39s
GCC Minimal w/o MPI	22m 59s
GCC 1D & 2D w/ MPI, QED tools	17m 35s
GCC ABLASTR w/o MPI	38s
Clang pywarpx	14m 37s
	1h 19m 28s

Provide feedback