feat: add gold diff convenience scripts #2861

Job	Run time
validation / Dependency info	4s
validation / GitHub context	3s
validation / Configuration files	10s
validation / Build coatjava	2m 22s
validation / Event generation (e_gFT)	1m 4s
validation / Event generation (e_pC)	1m 28s
validation / Event generation (eFT_K)	1m 38s
validation / Event generation (e_g)	58s
validation / Event generation (e_n)	59s
validation / Event generation (e_p)	1m 29s
validation / Run (e_gFT, rgb_fall2019)	5m 13s
validation / Run (eFT_K, rgb_fall2019)	4m 40s
validation / Run (e_g, rgb_fall2019)	4m 22s
validation / Run (e_n, rgb_fall2019)	4m 43s
validation / Run (e_p, rgb_fall2019)	4m 11s
validation / Run (e_pC, rgb_fall2019)	4m 24s
validation / Report efficiency	4s
validation / Report multiplicity	5s
	37m 57s

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