Add feature flag to enlarge player pool #1309

Job	Run time
jest (pageflow, package)	1m 22s
jest (pageflow-paged, entry_types/paged/packages/pageflow-paged)	1m 14s
trigger-edge-build	0s
rspec (pageflow, 3.2, ., bin/rspec --tag ~js, true)	6m 40s
jest (pageflow-paged-react, entry_types/paged/packages/pageflow-paged-react)	1m 8s
rspec (pageflow, 3.2, ~> 7.1, ., bin/rspec --tag ~js, true)	6m 20s
jest (pageflow-scrolled, entry_types/scrolled/package)	1m 37s
rspec (pageflow, 3.2, ., bin/rspec-with-retry --tag js)	5m 34s
rspec (pageflow, 3.2, ~> 7.1, ., bin/rspec-with-retry --tag js)	4m 56s
rspec (pageflow_paged, 3.2, entry_types/paged, pageflow_paged, bin/rspec)	4m 45s
rspec (pageflow_paged, 3.2, ~> 7.1, entry_types/paged, pageflow_paged, bin/rspec)	4m 44s
rspec (pageflow_scrolled, 3.2, entry_types/scrolled, pageflow_scrolled, bin/rspec --tag ~js)	5m 17s
rspec (pageflow_scrolled, 3.2, ~> 7.1, entry_types/scrolled, pageflow_scrolled, bin/rspec --tag ~js)	5m 18s
rspec (pageflow_scrolled, 3.2, entry_types/scrolled, pageflow_scrolled, bin/rspec-with-retry-on-t...	4m 53s
rspec (pageflow_scrolled, 3.2, ~> 7.1, entry_types/scrolled, pageflow_scrolled, bin/rspec-with-re...	5m 25s
	59m 13s

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