Revert "Support Rails 6 asset recompilation through webpacker" (#723) #150

Job	Run time
Ruby 2.6 (ubuntu-latest)	38s
Ruby 2.7 (ubuntu-latest)	44s
Ruby 3.0 (ubuntu-latest)	24s
Ruby 3.1 (ubuntu-latest)	34s
Ruby 3.2 (ubuntu-latest)	25s
Ruby jruby-head (ubuntu-latest)	1m 23s
Ruby 2.6 (macos-latest)	1m 10s
Ruby 2.7 (macos-latest)	1m 21s
Ruby 3.0 (macos-latest)	12s
Ruby 3.1 (macos-latest)	36s
Ruby 3.2 (macos-latest)	25s
Ruby jruby-head (macos-latest)	1m 35s
	9m 27s

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