fix: regression, Row Detail no longer displayed after CSP safe code

[ghiscoding]

with the CSP safe code implementation, the SlickRowDetail stopped working because it was using a hack. The hack was to using html string and add closing div tag to fall outside the .slick-cell but now that we use native HTML element then this hack no longer works. What we can do now is to add an optional insertElementAfterTarget that will provide a way to insert our Row Detail container element after our target which is this case is the .slick-cell

TODOs

• replace HTML string with the use of native HTML element inside SlickRowDetail
• add proper Cypress E2E tests to make sure that the row detail div is at the correct location in the DOM

before

after

the issue was because we append everything into the .slick-cell HTML element inside it but SlickRowDetail was hacking the html string to insert the HTML element after the .slick-cell. So our new code will simply do it in the correct way via insertElementAfterTarget

we can see below, the .dynamic-cell-detail div is supposed to go after the .slick-cell.l0.r0 but was instead within it which was wrong and causing the regression

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (8f706fc) 86.68% compared to head (b6bc5e2) 86.66%.

Files	Patch %	Lines
packages/common/src/core/slickGrid.ts	33.34%	2 Missing ⚠️
packages/common/src/services/domUtilities.ts	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             next    #1259      +/-   ##
==========================================
- Coverage   86.68%   86.66%   -0.01%     
==========================================
  Files         196      196              
  Lines       21388    21392       +4     
  Branches     7098     7099       +1     
==========================================
+ Hits        18537    18538       +1     
- Misses       2851     2854       +3     

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