[8.x] Add blacklight-frontend pin to importmap #3287

Job	Run time
lint	32s
docker_build	17s
test (ruby 3.3 / rails 7.1.5.1 )	4m 30s
test (ruby 3.3 / rails 7.2.2.1 )	4m 36s
test (ruby 3.3 / rails 8.0.1 )	3m 49s
test (ruby 3.3 / rails 8.0.1 / esbuild)	4m 6s
test (ruby 3.2 / rails 7.1.5.1 Solr 8.11.2)	4m 42s
test (ruby 3.1 / rails 7.1.5.1 )	4m 44s
test (ruby 3.1 / rails 7.1.5.1 / ViewComponent 2)	4m 47s
test (ruby 3.1 / rails 7.1.5.1 / Propshaft)	3m 54s
test (ruby 3.1 / rails 7.1.5.1 / Bootstrap 4)	4m 19s
test (ruby 3.3 / rails 7.1.5.1 / API)	2m 26s
test (ruby 3.3 / rails 7.2.2.1 / Propshaft, esbuild)	4m 0s
	46m 42s

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