Removed the loading skeleton when deleting rows

[Jinxiao0302]

Related to #1289

The loading skeleton is not showing in unrelated cells now when deleting rows.

Technical details
Added an extra parameter in fetch function of records.ts, which is set to be true in deleting is called:
fetch(
retainExistingRows = false,
isDeleteOperation = false
)

Screen shot

deleting.rows.mp4

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the master branch of the repository
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

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[codecov-commenter]

Codecov Report

Merging #1351 (9151093) into master (ad0c9b0) will increase coverage by 0.06%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #1351      +/-   ##
==========================================
+ Coverage   93.71%   93.78%   +0.06%     
==========================================
  Files         114      114              
  Lines        4439     4518      +79     
==========================================
+ Hits         4160     4237      +77     
- Misses        279      281       +2     

Flag	Coverage Δ
pytest-backend	93.78% <ø> (+0.06%)	⬆️

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

Impacted Files	Coverage Δ
db/records/operations/group.py	98.11% <0.00%> (-0.39%)	⬇️
mathesar/api/pagination.py	78.57% <0.00%> (ø)

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[pavish]

@Jinxiao0302 Nice work!

I made a small change to re-use the existing argument instead of the new argument which was introduced: dd3ab08