Refactor checkm2/databasedownload using aria2 #15581

Job	Run time
prettier	33s
nf-test-changes	30s
editorconfig	11s
pre-commit	43s
pytest-changes	8s
pytest	0s
nf-core-lint-modules	0s
nf-test (modules/nf-core/checkm2/predict, conda)	10m 51s
nf-core-lint-modules (checkm2/predict)	1m 57s
nf-test (modules/nf-core/checkm2/predict, docker_self_hosted)	9m 36s
nf-core-lint-modules (checkm2/databasedownload)	2m 10s
nf-test (modules/nf-core/checkm2/predict, singularity)	7m 39s
nf-test (modules/nf-core/checkm2/databasedownload, conda)	4m 45s
nf-test (modules/nf-core/checkm2/databasedownload, docker_self_hosted)	4m 57s
nf-test (modules/nf-core/checkm2/databasedownload, singularity)	3m 37s
confirm-pass	1s
	47m 38s

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