Change calculation for number of webworkers for web/desktop

[cmdcolin]

Currently the formula for getting number of web workers is a bit odd. (#cores -2) /3. probably an ad-hoc formula

On my machine it produces 5 workers (16 cores-2/3 = 4.666 Math.ceil to 5)

I think 5 on my machine with many cores is reasonable, if it used a lot more it would probably go too crazy (its a laptop...fans would take off)

But, on a 4 core AWS instance doing profiling tests, it is only getting 1 worker thread. I think maxing out hardware cores -1 for jbrowse, with a cap on 5 cpu's, could be a reasonable change to the formula

[codecov]

Codecov Report

Merging #2828 (2f1747f) into main (1d6e373) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 2f1747f differs from pull request most recent head ba8b499. Consider uploading reports for the commit ba8b499 to get more accurate results

@@           Coverage Diff           @@
##             main    #2828   +/-   ##
=======================================
  Coverage   59.98%   59.99%           
=======================================
  Files         584      584           
  Lines       26613    26688   +75     
  Branches     6459     6462    +3     
=======================================
+ Hits        15964    16011   +47     
- Misses      10335    10349   +14     
- Partials      314      328   +14     

Impacted Files	Coverage Δ
packages/core/rpc/BaseRpcDriver.ts	84.76% <100.00%> (ø)
...g/src/SvgFeatureRenderer/components/SvgOverlay.tsx	46.57% <0.00%> (-0.73%)	⬇️
packages/core/util/simpleFeature.ts	84.90% <0.00%> (ø)
...FeatureRenderer/components/ProcessedTranscript.tsx
...ns/svg/src/SvgFeatureRenderer/components/Arrow.tsx
...svg/src/SvgFeatureRenderer/components/Segments.tsx
...FeatureRenderer/components/SvgFeatureRendering.tsx
...gins/svg/src/SvgFeatureRenderer/components/Box.tsx
.../src/SvgFeatureRenderer/components/Subfeatures.tsx
...src/SvgFeatureRenderer/components/FeatureGlyph.tsx
... and 12 more

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