make tests faster

[mashehu]

run prettier only once on module.json during install and update
and some typing fixes

[codecov]

Codecov Report

Attention: 4 lines in your changes are missing coverage. Please review.

Comparison is base (a91d411) 74.88% compared to head (5aaaa2b) 75.04%.
Report is 40 commits behind head on dev.

❗ Current head 5aaaa2b differs from pull request most recent head 4110313. Consider uploading reports for the commit 4110313 to get more accurate results

Files	Patch %	Lines
nf_core/download.py	0.00%	2 Missing ⚠️
nf_core/__main__.py	75.00%	1 Missing ⚠️
nf_core/components/update.py	90.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev    #2573      +/-   ##
==========================================
+ Coverage   74.88%   75.04%   +0.15%     
==========================================
  Files          85       85              
  Lines        9222     9288      +66     
==========================================
+ Hits         6906     6970      +64     
- Misses       2316     2318       +2     

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