add stubs gatk4 #15454

Job	Run time
editorconfig	12s
prettier	29s
nf-test-changes	35s
pre-commit	1m 23s
pytest-changes	8s
pytest	0s
nf-core-lint-modules	0s
nf-core-lint-modules (gatk4/collectsvevidence)	1m 25s
nf-core-lint-modules (gatk4/applybqsr)	1m 18s
nf-core-lint-modules (gatk4/combinegvcfs)	2m 14s
nf-test (modules/nf-core/gatk4/collectsvevidence, conda)	7m 27s
nf-test (modules/nf-core/gatk4/collectsvevidence, docker_self_hosted)	4m 5s
nf-test (modules/nf-core/gatk4/collectsvevidence, singularity)	4m 52s
nf-test (modules/nf-core/gatk4/applybqsr, conda)	8m 57s
nf-test (modules/nf-core/gatk4/applybqsr, docker_self_hosted)	4m 37s
nf-test (modules/nf-core/gatk4/applybqsr, singularity)	4m 39s
nf-test (modules/nf-core/gatk4/combinegvcfs, conda)	4m 56s
nf-test (modules/nf-core/gatk4/combinegvcfs, docker_self_hosted)	3m 6s
nf-test (modules/nf-core/gatk4/combinegvcfs, singularity)	3m 17s
confirm-pass	1s
	53m 41s

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