Encapsulate stale_when_importmap_changes method #558

Job	Run time
Tests (Ruby 3.2, Gemfile)	1m 29s
Tests (Ruby 3.2, gemfiles/rails_7_0_propshaft.gemfile)	46s
Tests (Ruby 3.2, gemfiles/rails_7_1_propshaft.gemfile)	45s
Tests (Ruby 3.2, gemfiles/rails_7_2_propshaft.gemfile)	45s
Tests (Ruby 3.2, gemfiles/rails_main_propshaft.gemfile)	51s
Tests (Ruby 3.2, gemfiles/rails_7_0_sprockets.gemfile)	39s
Tests (Ruby 3.2, gemfiles/rails_7_1_sprockets.gemfile)	44s
Tests (Ruby 3.2, gemfiles/rails_7_2_sprockets.gemfile)	46s
Tests (Ruby 3.2, gemfiles/rails_main_sprockets.gemfile)	52s
Tests (Ruby 3.3, Gemfile)	1m 41s
Tests (Ruby 3.3, gemfiles/rails_7_0_propshaft.gemfile)	47s
Tests (Ruby 3.3, gemfiles/rails_7_1_propshaft.gemfile)	48s
Tests (Ruby 3.3, gemfiles/rails_7_2_propshaft.gemfile)	1m 0s
Tests (Ruby 3.3, gemfiles/rails_main_propshaft.gemfile)	56s
Tests (Ruby 3.3, gemfiles/rails_7_0_sprockets.gemfile)	44s
Tests (Ruby 3.3, gemfiles/rails_7_1_sprockets.gemfile)	46s
Tests (Ruby 3.3, gemfiles/rails_7_2_sprockets.gemfile)	48s
Tests (Ruby 3.3, gemfiles/rails_main_sprockets.gemfile)	56s
Tests (Ruby 3.1, gemfiles/rails_7_0_propshaft.gemfile)	41s
Tests (Ruby 3.1, gemfiles/rails_7_1_propshaft.gemfile)	41s
Tests (Ruby 3.1, gemfiles/rails_7_0_sprockets.gemfile)	40s
Tests (Ruby 3.1, gemfiles/rails_7_1_sprockets.gemfile)	44s
	18m 49s

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