Avoid crash on badly encoded GFF attributes

[cmdcolin]

Some files are badly encoded (not following e.g. GFF3 spec) and cause decodeURIComponent to throw. This is not a good user experience. This PR just proposes passing the string along

addresses #4268

[codecov]

Codecov Report

Attention: Patch coverage is 42.85714% with 8 lines in your changes are missing coverage. Please review.

Project coverage is 62.59%. Comparing base (c8fc800) to head (bc338d9).
Report is 3 commits behind head on main.

Files	Patch %	Lines
packages/text-indexing/src/util.ts	0.00%	4 Missing ⚠️
packages/text-indexing/src/types/vcfAdapter.ts	0.00%	3 Missing ⚠️
products/jbrowse-cli/src/util.ts	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #4269      +/-   ##
==========================================
- Coverage   62.68%   62.59%   -0.10%     
==========================================
  Files        1087     1087              
  Lines       31392    31404      +12     
  Branches     7493     7497       +4     
==========================================
- Hits        19678    19656      -22     
- Misses      11538    11575      +37     
+ Partials      176      173       -3     

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