simplify logic for parsing of container configs

[mashehu]

Might be easier to review by commit.

The general rational:
No need to run nextflow inspect, if we anyway just check meta.yml in the end. Instead, parse a meta.yml for a specific module (update_container_config) or for all modules (generate_container_config) and build the container configs through there (getting the process name from the main.nf file on the way).

[codecov]

Codecov Report

❌ Patch coverage is 91.86047% with 7 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.27%. Comparing base (b6af91a) to head (e472701).

Files with missing lines	Patch %	Lines
nf_core/pipelines/containers_utils.py	91.25%	7 Missing ⚠️

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