Convert Ruby testing workflow to reusable workflow #15301

Job	Run time
examples / examples	1m 55s
pre-commit / pre-commit	56s
test / test (3.2, ubuntu-latest)	45s
test / test (jruby-9.4.12.0, ubuntu-latest)	2m 44s
test / test (2.7, ubuntu-latest)	1m 0s
report	0s
	7m 20s

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