Fix: missing generators in gemfiles #8192

Job	Run time
Test compatibility with Primer ViewComponents (main)	17m 5s
benchmark	1m 36s
test (Rails 7.1, Ruby 3.2)	40s
test (Rails main, Ruby head)	1m 45s
test (Rails 8.0, Ruby 3.4)	43s
test (Rails 7.2, Ruby 3.3)	49s
coverage	0s
	22m 38s

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