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remove example engine (#1224) #2874

Job	Run time
build_macos	2m 40s
download_test_data	6s
java_matrix	4s
build	2m 51s
unit_tests (21)	2m 54s
unit_tests (25)	2m 53s
test_coatjava_macos	2m 18s
test_decoder	1m 52s
spotbugs	7m 1s
test_clara	4m 35s
test_run-groovy	35s
test_coatjava (ubuntu-latest, kpp)	3m 0s
test_coatjava (ubuntu-latest, eb-ep)	2m 7s
test_coatjava (ubuntu-latest, eb-enc)	2m 23s
test_coatjava (ubuntu-latest, eb-eftpi)	2m 46s
test_coatjava (ubuntu-latest, eb-epc)	2m 13s
test_coatjava (ubuntu-latest, eb-eg)	2m 47s
release_build	0s
generate_documentation	1m 1s
deploy_web_pages	10s
final	3s
	44m 19s