Improvements to output logic

[somewhatabstract]

Summary:

• Fixes a bug that would lead to some files failing to report their errors if other files had unfixable problems
• Fixes a bug that would lead to some auto-fixes not being applied if other files had unfixable problems
• Outputs list of files with unfixable errors
• Changes labels of log output to fixed width and changes formatting to try and make things easier to read
• Changes all unfixable errors to be output as actual errors
• Adds a little more verbose logging

Issue: XXX-XXXX

Test plan:

yarn test

Also ran the tool to check.

[codecov]

Codecov Report

Merging #849 (0b07f36) into main (1b7b343) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #849   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           34        34           
  Lines          682       686    +4     
  Branches       145       148    +3     
=========================================
+ Hits           682       686    +4     

Impacted Files	Coverage Δ
src/format.js	100.00% <100.00%> (ø)
src/maybe-report-error.js	100.00% <100.00%> (ø)
src/output-sink.js	100.00% <100.00%> (ø)

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