Use path.resolve to fix --load symlink in jbrowse CLI

[cmdcolin]

This fixes #2685

This always creates a resolved, absolute path for a symlink

This makes the change for both add-assembly and add-track

[cmdcolin]

this would always create a absolute path when using symlinks. there may be some rare cases where having relative symlinks (sort of hypothetical like moving a group of directories around or similar) but I think this is probably ok and better than the behavior currently in place with relative symlinks

[codecov]

Codecov Report

Merging #2686 (85562f4) into main (baf56eb) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main    #2686      +/-   ##
==========================================
+ Coverage   60.67%   60.71%   +0.04%     
==========================================
  Files         561      561              
  Lines       26313    26313              
  Branches     6409     6409              
==========================================
+ Hits        15965    15976      +11     
+ Misses      10022    10011      -11     
  Partials      326      326              

Impacted Files	Coverage Δ
products/jbrowse-cli/src/commands/add-assembly.ts	88.88% <ø> (ø)
products/jbrowse-cli/src/commands/add-track.ts	63.55% <100.00%> (ø)
products/jbrowse-web/src/util.ts	27.27% <0.00%> (ø)
.../linear-genome-view/src/LinearGenomeView/index.tsx	84.00% <0.00%> (+0.16%)	⬆️
...inearGenomeView/components/RefNameAutocomplete.tsx	80.80% <0.00%> (+3.03%)	⬆️
packages/core/TextSearch/TextSearchManager.ts	100.00% <0.00%> (+3.44%)	⬆️
...nts/src/SNPCoverageRenderer/SNPCoverageRenderer.ts	71.55% <0.00%> (+5.50%)	⬆️

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