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remove unused & deprecated event-builder stuff #3571

Job	Run time
java_matrix	3s
build_macos	3m 9s
download_test_data	4s
build	3m 53s
unit_tests (21)	3m 15s
unit_tests (25)	3m 20s
test_coatjava_macos	3m 4s
spotbugs	6m 23s
test_decoder	2m 22s
test_clara	4m 42s
test_run-groovy	1m 19s
test_coatjava (ubuntu-latest, kpp)	2m 54s
test_coatjava (ubuntu-latest, eb-epc)	2m 41s
test_coatjava (ubuntu-latest, eb-eftpi)	2m 20s
test_coatjava (ubuntu-latest, eb-eg)	2m 17s
test_coatjava (ubuntu-latest, eb-ep)	1m 54s
test_coatjava (ubuntu-latest, eb-en)	1m 48s
test_coatjava (ubuntu-latest, eb-enc)	2m 52s
release_build	-1s
generate_documentation	1m 1s
deploy_web_pages	0s
test_qcddat	1m 30s
final	4s
	50m 54s