Add more unit test for share/delete api

[Hailong-am]

Description

1. make addToWorkspaceOptions extends SavedObjectsBaseOptions
2. Add unit test

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 #184 (3288e55) into workspace (37171cf) will increase coverage by 0.09%.
The diff coverage is 61.11%.

@@              Coverage Diff              @@
##           workspace     #184      +/-   ##
=============================================
+ Coverage      66.12%   66.21%   +0.09%     
=============================================
  Files           3420     3420              
  Lines          65753    65755       +2     
  Branches       10590    10589       -1     
=============================================
+ Hits           43479    43541      +62     
+ Misses         19633    19571      -62     
- Partials        2641     2643       +2     

Flag	Coverage Δ
Linux_1	30.42% <0.00%> (-0.01%)	⬇️
Linux_2	55.38% <61.11%> (+0.26%)	⬆️
Linux_3	42.76% <0.00%> (-0.01%)	⬇️
Linux_4	34.51% <0.00%> (-0.01%)	⬇️

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

Files	Coverage Δ
src/core/server/index.ts	100.00% <ø> (ø)
src/core/server/saved_objects/routes/utils.ts	100.00% <100.00%> (ø)
...saved_objects/service/saved_objects_client.mock.ts	100.00% <ø> (ø)
...rver/saved_objects/service/saved_objects_client.ts	55.17% <ø> (ø)
...ore/server/saved_objects/service/lib/repository.ts	89.43% <76.92%> (+11.09%)	⬆️
src/core/server/saved_objects/routes/share.ts	12.00% <0.00%> (-0.50%)	⬇️

... and 1 file with indirect coverage changes

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