Revert "run migration notice on pull_request_target" (#4424) #7

Job	Run time
pytest-changes	1s
prettier	1s
editorconfig	1s
nf-test-changes	5s
nf-test (fgbio/fastqtobam, docker)	3m 20s
nf-test (fgbio/fastqtobam, singularity)	3m 42s
nf-test (fgbio/fastqtobam, conda)	5m 35s
nf-test (mosdepth, docker)	3m 4s
nf-test (mosdepth, singularity)	2m 45s
nf-test (mosdepth, conda)	32s
nf-test Migration Notice	1s
nf-core-lint	1s
pytest	1s
confirm-pass	1s
	19m 10s

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