Add nf-core module and subworkflow `mirdeep2` #15517

Job	Run time
prettier	35s
pytest-changes	4s
editorconfig	11s
nf-test-changes	40s
pre-commit	37s
pytest	0s
nf-core-lint-modules (fastq_find_mirna_mirdeep2)	46s
nf-core-lint-modules (mirdeep2/mapper)	1m 37s
nf-core-lint-modules (mirdeep2/mirdeep2)	2m 1s
nf-test (modules/nf-core/mirdeep2/mapper, conda)	6m 56s
nf-test (modules/nf-core/mirdeep2/mapper, docker_self_hosted)	2m 49s
nf-test (modules/nf-core/mirdeep2/mapper, singularity)	2m 53s
nf-test (subworkflows/nf-core/fastq_find_mirna_mirdeep2, conda)	2m 30s
nf-test (subworkflows/nf-core/fastq_find_mirna_mirdeep2, docker_self_hosted)	5m 32s
nf-test (subworkflows/nf-core/fastq_find_mirna_mirdeep2, singularity)	4m 49s
nf-test (modules/nf-core/mirdeep2/mirdeep2, conda)	6m 41s
nf-test (modules/nf-core/mirdeep2/mirdeep2, docker_self_hosted)	3m 36s
nf-test (modules/nf-core/mirdeep2/mirdeep2, singularity)	3m 3s
confirm-pass	1s
	45m 21s

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