Refactor UI setting register

[ruanyl]

Description

• refactor: move workspace uiSettings registration to workspace service
• refactor: call workspace client init from workspace plugin

Check List

• All tests pass
  • yarn test:jest
  • yarn test:jest_integration
  • yarn test:ftr
• New functionality includes testing.
• New functionality has been documented.
• Update CHANGELOG.md
• Commits are signed per the DCO using --signoff

[codecov-commenter]

Codecov Report

Merging #77 (66ee512) into workspace (8bacb1b) will decrease coverage by 0.52%.
Report is 3 commits behind head on workspace.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##           workspace      #77      +/-   ##
=============================================
- Coverage      65.70%   65.19%   -0.52%     
=============================================
  Files           3342     3342              
  Lines          64533    65089     +556     
  Branches       10255    10460     +205     
=============================================
+ Hits           42404    42437      +33     
- Misses         19597    20124     +527     
+ Partials        2532     2528       -4     

Flag	Coverage Δ
Linux_1	34.53% <ø> (?)
Linux_3	42.42% <50.00%> (-0.17%)	⬇️
Windows_1	34.69% <ø> (+<0.01%)	⬆️
Windows_2	54.48% <100.00%> (+<0.01%)	⬆️
Windows_3	42.59% <50.00%> (+<0.01%)	⬆️
Windows_4	34.73% <50.00%> (+<0.01%)	⬆️

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

Files Changed	Coverage Δ
src/core/public/workspace/workspaces_service.ts	33.33% <ø> (+6.06%)	⬆️
src/core/server/server.ts	98.92% <ø> (ø)
src/core/server/ui_settings/settings/index.ts	100.00% <ø> (ø)
src/core/server/workspaces/ui_settings.ts	100.00% <100.00%> (ø)
src/core/server/workspaces/workspaces_service.ts	65.00% <100.00%> (+1.84%)	⬆️

... and 16 files with indirect coverage changes

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