Move RailsVersion helper from support to core gem #1220

Job	Run time
jest (pageflow, package)	2m 12s
rspec (pageflow, 2.6, ., bin/rspec --tag ~js, true)	6m 47s
trigger-edge-build	0s
jest (pageflow-paged, entry_types/paged/packages/pageflow-paged)	1m 43s
rspec (pageflow, 3.2, ~> 6.1, ., bin/rspec --tag ~js, true)	6m 18s
rspec (pageflow, 2.6, ., bin/rspec-with-retry --tag js)	4m 27s
jest (pageflow-paged-react, entry_types/paged/packages/pageflow-paged-react)	1m 30s
rspec (pageflow, 3.2, ~> 6.1, ., bin/rspec-with-retry --tag js)	4m 19s
jest (pageflow-scrolled, entry_types/scrolled/package)	3m 38s
rspec (pageflow_paged, 2.6, entry_types/paged, pageflow_paged, bin/rspec)	3m 39s
rspec (pageflow_paged, 3.2, ~> 6.1, entry_types/paged, pageflow_paged, bin/rspec)	3m 47s
rspec (pageflow_scrolled, 2.6, entry_types/scrolled, pageflow_scrolled, bin/rspec --tag ~js)	4m 48s
rspec (pageflow_scrolled, 3.2, ~> 6.1, entry_types/scrolled, pageflow_scrolled, bin/rspec --tag ~js)	5m 20s
rspec (pageflow_scrolled, 2.6, entry_types/scrolled, pageflow_scrolled, bin/rspec-with-retry-on-t...	5m 47s
rspec (pageflow_scrolled, 3.2, ~> 6.1, entry_types/scrolled, pageflow_scrolled, bin/rspec-with-re...	5m 13s
	59m 28s

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