Adds code improvements to GridBookmarkWidget

[carolinebridge]

Leverages work done by @cmdcolin from #3932

Accepts most recommended changes to code styling while fixing bugs and preserving functionality.

Summary of changes:

• uses Set where applicable to improve lookup performance
• moves dialogs into lazy loaded components
• removes list of bookmarks to be deleted
• removes select styling, replaces with smaller component for code readability
• clarifies messaging for label editing
• preserves multi-select for assemblies
• bookmarksWithValidAssemblies needs to use the JSON "hack" to get around state restrictions with mobx -- if there are better alternatives here, open to suggestion. Without mutating the object like this, there is a crash if you try to share selected bookmarks

[codecov]

Codecov Report

Merging #3938 (0836213) into main (ce05256) will decrease coverage by 0.34%.
The diff coverage is 31.68%.

@@            Coverage Diff             @@
##             main    #3938      +/-   ##
==========================================
- Coverage   64.04%   63.71%   -0.34%     
==========================================
  Files        1013     1018       +5     
  Lines       30177    30189      +12     
  Branches     7195     7200       +5     
==========================================
- Hits        19327    19235      -92     
- Misses      10687    10790     +103     
- Partials      163      164       +1     

Files Changed	Coverage Δ
packages/core/assemblyManager/assemblyManager.ts	74.64% <ø> (ø)
...ookmarkWidget/components/DeleteBookmarksDialog.tsx	0.00% <0.00%> (ø)
...ookmarkWidget/components/ImportBookmarksDialog.tsx	0.00% <0.00%> (ø)
...BookmarkWidget/components/ShareBookmarksDialog.tsx	0.00% <0.00%> (ø)
.../GridBookmarkWidget/components/ImportBookmarks.tsx	60.00% <42.85%> (+27.69%)	⬆️
.../GridBookmarkWidget/components/DeleteBookmarks.tsx	55.55% <50.00%> (+10.10%)	⬆️
...c/GridBookmarkWidget/components/ShareBookmarks.tsx	55.55% <50.00%> (-11.76%)	⬇️
...gins/grid-bookmark/src/GridBookmarkWidget/model.ts	60.46% <61.53%> (-3.49%)	⬇️
...GridBookmarkWidget/components/AssemblySelector.tsx	61.90% <72.72%> (-3.32%)	⬇️
...ookmarkWidget/components/ExportBookmarksDialog.tsx	86.66% <86.66%> (ø)
... and 5 more

... and 5 files with indirect coverage changes

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