Add Custom Scheduler Name to Build and BuildRun objects #3880

Job	Run time
unit	3m 14s
e2e (v1.29.12, v0.59.5)	46m 1s
integration (v1.29.12, v0.59.5)	3m 40s
e2e (v1.29.12, v0.68.0)	46m 19s
test-docker-build (base)	45s
integration (v1.29.12, v0.68.0)	3m 40s
e2e (v1.32.0, v0.59.5)	48m 43s
test-docker-build (git)	59s
integration (v1.32.0, v0.59.5)	3m 33s
e2e (v1.32.0, v0.68.0)	46m 10s
test-docker-build (image-processing)	51s
integration (v1.32.0, v0.68.0)	4m 6s
test-docker-build (waiter)	42s
	3h 28m 43s

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