Convert Ruby testing workflow to reusable workflow #15317

Job	Run time
test / test (3.2, ubuntu-latest)	44s
pre-commit / pre-commit	1m 3s
test / test (2.7, ubuntu-latest)	1m 9s
test / test (jruby-9.4.12.0, ubuntu-latest)	3m 0s
examples / examples	1m 57s
report	0s
	7m 53s

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