[Backport workspace]Add unit test for delete saved objects by workspace

[Hailong-am]

Description

Backport delete saved objects by workspace unit test cases into workspace branch

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 #229 (84f05e2) into workspace (2964934) will increase coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           workspace     #229   +/-   ##
==========================================
  Coverage      66.21%   66.22%           
==========================================
  Files           3422     3422           
  Lines          65748    65748           
  Branches       10587    10587           
==========================================
+ Hits           43538    43539    +1     
+ Misses         19566    19565    -1     
  Partials        2644     2644           

Flag	Coverage Δ
Linux_1	30.42% <ø> (ø)
Linux_2	55.36% <ø> (+<0.01%)	⬆️
Linux_3	42.78% <ø> (ø)
Linux_4	34.53% <ø> (ø)

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

Files	Coverage Δ
...ore/server/saved_objects/service/lib/repository.ts	89.43% <ø> (ø)

... and 1 file with indirect coverage changes

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