Allow user to select local assembly to add tracks to for trackhub registry

[cmdcolin]

This allows a user to select a local assembly name to add their tracks from the trackhub registry to

It might be the case that the name of the user's local assembly does not match the remote name provided by the trackhub, so this allows the user to select the local assembly to add the trackhub tracks to.

[cmdcolin]

Allowing us to load assemblies from the trackhub itself may also be a good add on

[codecov]

Codecov Report

Merging #3229 (c0e7fe0) into main (5ef8f93) will increase coverage by 0.01%.
The diff coverage is 16.66%.

❗ Current head c0e7fe0 differs from pull request most recent head 06995fa. Consider uploading reports for the commit 06995fa to get more accurate results

@@            Coverage Diff             @@
##             main    #3229      +/-   ##
==========================================
+ Coverage   59.40%   59.42%   +0.01%     
==========================================
  Files         672      672              
  Lines       28775    28785      +10     
  Branches     7001     6998       -3     
==========================================
+ Hits        17095    17105      +10     
+ Misses      11405    11400       -5     
- Partials      275      280       +5     

Impacted Files	Coverage Δ
...onnectionWidget/components/AddConnectionWidget.tsx	87.80% <ø> (ø)
...y/src/trackhub-registry/TrackHubRegistrySelect.tsx	0.00% <0.00%> (ø)
...ionEditorWidget/components/ConfigurationEditor.tsx	89.18% <100.00%> (ø)
...onnectionWidget/components/ConfigureConnection.tsx	100.00% <100.00%> (ø)
packages/core/ui/theme.ts	83.33% <0.00%> (-1.29%)	⬇️
products/jbrowse-web/src/util.ts	48.33% <0.00%> (ø)
packages/core/util/types/index.ts	67.46% <0.00%> (ø)
.../linear-genome-view/src/LinearGenomeView/index.tsx	83.17% <0.00%> (ø)
...inearPileupDisplay/components/SetFeatureHeight.tsx	0.00% <0.00%> (ø)
...nearGenomeView/components/SequenceSearchDialog.tsx	0.00% <0.00%> (ø)
... and 10 more

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