Update inspector report file counts and output when 0 issues detected

[stephprince]

Motivation

Fix #385. Fix #359.

Adds the total number of files scanned to the report and provides a specific message if no issues were detected.

Also fixes an extra file being counted by updating the file path message when check_unique_identifiers is raised. The original issue mentioned maybe displaying the number of directories, but I think this could potentially lead to more confusion with NWB Zarr files. I think check_unique_identifiers is also a slightly unique case that is performed at the folder level before other checks.

todo:

• add tests
• update CHANGELOG

[codecov-commenter]

Codecov Report

❌ Patch coverage is 76.92308% with 9 lines in your changes missing coverage. Please review.
✅ Project coverage is 80.51%. Comparing base (5a8562e) to head (9ab82f3).

Files with missing lines	Patch %	Lines
src/nwbinspector/_nwbinspector_cli.py	0.00%	7 Missing ⚠️
src/nwbinspector/_formatting.py	83.33%	1 Missing ⚠️
src/nwbinspector/utils/_utils.py	91.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #629      +/-   ##
==========================================
+ Coverage   73.03%   80.51%   +7.47%     
==========================================
  Files          47       47              
  Lines        1587     1606      +19     
==========================================
+ Hits         1159     1293     +134     
+ Misses        428      313     -115     

Files with missing lines	Coverage Δ
src/nwbinspector/_dandi_inspection.py	97.95% <100.00%> (+76.80%)	⬆️
src/nwbinspector/_nwb_inspection.py	86.56% <100.00%> (+4.17%)	⬆️
src/nwbinspector/tools/__init__.py	100.00% <100.00%> (ø)
src/nwbinspector/tools/_dandi.py	37.83% <100.00%> (+17.14%)	⬆️
src/nwbinspector/utils/__init__.py	100.00% <ø> (ø)
src/nwbinspector/_formatting.py	69.93% <83.33%> (+46.90%)	⬆️
src/nwbinspector/utils/_utils.py	86.40% <91.66%> (+0.55%)	⬆️
src/nwbinspector/_nwbinspector_cli.py	0.00% <0.00%> (ø)

... and 2 files with indirect coverage changes

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