Don't lint pipeline name if manifest.name in .nf-core.yml

[mirpedrol]

Close #2027

Linting only checks for the pipeline name if manifes.name is not specified in .nf-core.yml

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[codecov]

Codecov Report

Merging #2035 (a60e5ea) into dev (bbb5415) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##              dev    #2035   +/-   ##
=======================================
  Coverage   67.60%   67.60%           
=======================================
  Files          43       43           
  Lines        5572     5572           
=======================================
  Hits         3767     3767           
  Misses       1805     1805           

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