refactor: Split long lines

[l0b0]

Gets rid of most of the flake8 exclude comments.

Related Issue(s): #331

Description:

PR Checklist:

• Code is formatted (run pre-commit run --all-files)
• Tests pass (run scripts/test)
• Documentation has been updated to reflect changes, if applicable
• This PR maintains or improves overall codebase code coverage.
• Changes are added to the CHANGELOG. See the docs for information about adding to the changelog.

[codecov-commenter]

Codecov Report

Merging #536 (c6250cb) into main (83a6598) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main     #536   +/-   ##
=======================================
  Coverage   94.19%   94.19%           
=======================================
  Files          71       71           
  Lines       10302    10302           
  Branches     1072     1072           
=======================================
  Hits         9704     9704           
  Misses        430      430           
  Partials      168      168           

Impacted Files	Coverage Δ
pystac/catalog.py	91.64% <ø> (ø)
pystac/extensions/eo.py	94.33% <ø> (ø)
pystac/extensions/projection.py	97.60% <ø> (ø)
pystac/extensions/raster.py	88.80% <ø> (ø)
pystac/serialization/migrate.py	81.66% <ø> (ø)
tests/utils/test_cases.py	100.00% <ø> (ø)

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