delete ghost tests #15688

Job	Run time
pre-commit / pre-commit	2m 59s
test / test (3.2, ubuntu-latest)	1m 52s
test / test (2.7, ubuntu-latest)	2m 9s
test / test (jruby-9.4.12.0, ubuntu-latest)	3m 4s
examples / examples	2m 7s
report	7s
	12m 18s

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