Remove trackhub registry plugin from core plugins, moved to plugin store

[cmdcolin]

As nice as trackhub registry is, they changed the API format on us so now it does not work

a) now requires application/json content-type which we did not have, so crashes currently with a HTTP 415
b) renamed id->trackhub_id in response JSON which breaks our map in several places

I propose removing it from our corePlugins, and moving to an external (not done yet) where it can be updated as needed

[codecov]

Codecov Report

Merging #3407 (7de7afc) into main (5568a08) will increase coverage by 0.53%.
The diff coverage is n/a.

❗ Current head 7de7afc differs from pull request most recent head c4b74c1. Consider uploading reports for the commit c4b74c1 to get more accurate results

@@            Coverage Diff             @@
##             main    #3407      +/-   ##
==========================================
+ Coverage   60.51%   61.04%   +0.53%     
==========================================
  Files         824      816       -8     
  Lines       29791    29522     -269     
  Branches     7187     7100      -87     
==========================================
- Hits        18027    18023       -4     
+ Misses      11578    11322     -256     
+ Partials      186      177       -9     

Impacted Files	Coverage Δ
products/jbrowse-desktop/src/corePlugins.ts	100.00% <ø> (ø)
products/jbrowse-web/src/corePlugins.ts	100.00% <ø> (ø)
products/jbrowse-web/src/util.ts	48.33% <0.00%> (ø)
packages/core/ui/PrerenderedCanvas.tsx	90.90% <0.00%> (ø)
...iveDisplay/components/LinearComparativeDisplay.tsx	100.00% <0.00%> (ø)
...ome-view/src/LinearGenomeView/components/Ruler.tsx	100.00% <0.00%> (+5.55%)	⬆️

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