Replace utils.check_input_dir() with os.path.abspath()

[vinferrer]

Closes #335

Replace utils.check_input_dir() with os.path.abspath().

Proposed Changes

• Replace utils.check_input_dir() with os.path.abspath() in all functions
• Delete function from utils.py
• Delete unit tests

Change Type

• bugfix (+0.0.1)
• minor (+0.1.0)
• major (+1.0.0)
• refactoring (no version update)
• test (no version update)
• infrastructure (no version update)
• documentation (no version update)
• other

Checklist before review

• I added everything I wanted to add to this PR.
• [Code or tests only] I wrote/updated the necessary docstrings.
• [Code or tests only] I ran and passed tests locally.
• [Documentation only] I built the docs locally.
• My contribution is harmonious with the rest of the code: I'm not introducing repetitions.
• My code respects the adopted style, especially linting conventions.
• The title of this PR is explanatory on its own, enough to be understood as part of a changelog.
• I added or indicated the right labels.

• I added information regarding the timeline of completion for this PR.

• Please, comment on my PR while it's a draft and give me feedback on the development!

[codecov]

Codecov Report

Merging #368 (c9ddc8e) into master (42bbffd) will decrease coverage by 0.02%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #368      +/-   ##
==========================================
- Coverage   94.64%   94.61%   -0.03%     
==========================================
  Files           8        8              
  Lines         840      836       -4     
==========================================
- Hits          795      791       -4     
  Misses         45       45              

Impacted Files	Coverage Δ
phys2bids/utils.py	98.43% <ø> (-0.10%)	⬇️
phys2bids/phys2bids.py	88.06% <100.00%> (ø)

[eurunuela]

LGTM! Thanks!

[tsalo]

Thanks!