Configurable gallery visibility

[fiskus]

• Moved image grids from Bucket/Overview.js and Bucket/Summary.js to Bucket/Gallery.tsx
• Added ui.blocks.gallery to BucketPreferences
• Migrate BucketPreferences to taggedV2 #3436 Used BucketPreferences.Result based on taggedV2 for async rendering

• Documentation
• Changelog entry (skip if change is not significant to end users, e.g. docs only)

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[codecov]

Codecov Report

Merging #3421 (46fb568) into master (d1df293) will decrease coverage by 0.04%.
The diff coverage is 5.35%.

@@            Coverage Diff             @@
##           master    #3421      +/-   ##
==========================================
- Coverage   36.22%   36.19%   -0.04%     
==========================================
  Files         682      683       +1     
  Lines       29787    29831      +44     
  Branches     4383     4394      +11     
==========================================
+ Hits        10790    10796       +6     
- Misses      17841    17875      +34     
- Partials     1156     1160       +4     

Flag	Coverage Δ
api-python	91.29% <ø> (ø)
catalog	10.23% <5.35%> (+<0.01%)	⬆️
lambda	86.01% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
catalog/app/containers/Bucket/Gallery.tsx	0.00% <0.00%> (ø)
catalog/app/containers/Bucket/Meta.tsx	0.00% <0.00%> (ø)
catalog/app/containers/Bucket/Overview.js	0.00% <0.00%> (ø)
catalog/app/containers/Bucket/Summarize.tsx	0.00% <0.00%> (ø)
catalog/app/containers/Bucket/Summary.js	0.00% <0.00%> (ø)
.../app/containers/Bucket/requests/requestsUntyped.js	20.96% <33.33%> (+0.20%)	⬆️
...g/app/utils/BucketPreferences/BucketPreferences.ts	70.66% <50.00%> (-3.18%)	⬇️

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[fiskus]

BucketPreferences refactoring moved to #3436

[fiskus]

Fixed some silly mistakes