Remove unused asset generator #3267

Job	Run time
docker_build	25s
lint	33s
test (ruby 3.3 / rails 7.0.8.6 )	3m 38s
test (ruby 3.3 / rails 7.1.5 )	3m 33s
test (ruby 3.3 / rails 7.2.2 )	4m 2s
test (ruby 3.3 / rails 8.0.0 )	3m 58s
test (ruby 3.3 / rails 8.0.0 / esbuild)	3m 59s
test (ruby 3.2 / rails 7.0.8.6 )	3m 29s
test (ruby 3.2 / rails 7.1.5 Solr 8.11.2)	4m 5s
test (ruby 3.1 / rails 7.1.5 )	3m 20s
test (ruby 3.1 / rails 7.0.8.6 / Propshaft)	4m 15s
test (ruby 3.3 / rails 7.1.5 / API)	2m 16s
test (ruby 3.3 / rails 7.2.2 / Propshaft, esbuild)	3m 53s
	41m 26s

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