Add jsdom to jbrowse-img to fix --noRasterize option

[cmdcolin]

Fixes #2997

[cmdcolin]

now has a test that exercises the --noRasterize code path, running jest with --env node to accurately show how it would run on the CLI

[codecov]

Codecov Report

Merging #3009 (5eda5e6) into main (a6a44a9) will decrease coverage by 0.03%.
The diff coverage is 0.00%.

@@            Coverage Diff             @@
##             main    #3009      +/-   ##
==========================================
- Coverage   60.79%   60.75%   -0.04%     
==========================================
  Files         584      584              
  Lines       26588    26600      +12     
  Branches     6441     6441              
==========================================
- Hits        16163    16161       -2     
- Misses      10119    10132      +13     
- Partials      306      307       +1     

Impacted Files	Coverage Δ
products/jbrowse-img/src/index.js	0.00% <0.00%> (ø)
products/jbrowse-img/src/index.testmod.js	0.00% <0.00%> (ø)
...quenceRenderer/components/DivSequenceRendering.tsx	92.55% <0.00%> (-2.13%)	⬇️
products/jbrowse-web/src/util.ts	27.27% <0.00%> (ø)

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