add unit tests for workspace core service (#191)

[ruanyl]

• workspace integration branch pr patch which includes:

1. WorkspaceService unit test
2. Some renames

Description

Issues Resolved

Screenshot

Testing the changes

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 #197 (3302635) into workspace (a2abcf2) will increase coverage by 0.02%.
Report is 1 commits behind head on workspace.
The diff coverage is 100.00%.

@@              Coverage Diff              @@
##           workspace     #197      +/-   ##
=============================================
+ Coverage      66.09%   66.12%   +0.02%     
=============================================
  Files           3420     3420              
  Lines          65752    65753       +1     
  Branches       10589    10590       +1     
=============================================
+ Hits           43461    43480      +19     
+ Misses         19650    19633      -17     
+ Partials        2641     2640       -1     

Flag	Coverage Δ
Linux_1	30.42% <33.33%> (+<0.01%)	⬆️
Linux_2	55.12% <100.00%> (+0.06%)	⬆️
Linux_3	42.76% <33.33%> (+0.01%)	⬆️
Linux_4	34.52% <33.33%> (+<0.01%)	⬆️

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

Files Changed	Coverage Δ
src/core/public/chrome/chrome_service.tsx	91.42% <ø> (ø)
...c/core/public/chrome/ui/header/collapsible_nav.tsx	98.11% <ø> (ø)
...public/chrome/ui/header/collapsible_nav_header.tsx	60.00% <ø> (ø)
src/core/public/chrome/ui/header/header.tsx	75.00% <ø> (ø)
src/core/public/mocks.ts	59.09% <ø> (ø)
src/core/public/workspace/workspaces_service.ts	96.29% <ø> (+59.25%)	⬆️
...blic/application/opensearch_dashboards_services.ts	20.00% <ø> (ø)
...ction/objects_table/components/duplicate_modal.tsx	0.00% <ø> (ø)
...ment_section/objects_table/saved_objects_table.tsx	57.35% <ø> (ø)
src/core/public/core_system.test.mocks.ts	100.00% <100.00%> (ø)
... and 2 more

... and 2 files with indirect coverage changes

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