Rename processors to processor groups #16188

Job	Run time
pre-commit / pre-commit	1m 45s
examples / examples	2m 16s
test / test (3.2, ubuntu-latest)	2m 13s
test / test (2.7, ubuntu-latest)	2m 30s
test / test (jruby-9.4.12.0, ubuntu-latest)	2m 29s
report	12s
	11m 25s

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