Test grid reparenting

[ruggi]

This is a followup to #6264 and #6258 , adding automated tests for reparenting strategies concerning grids.

Fixes #6268

[github-actions]

Try me

[relativeci]

#13974 Bundle Size — 62.54MiB (+0.05%).

bcc441c(current) vs 916e8b9 master#13968(baseline)

Warning

Bundle contains 70 duplicate packages – View duplicate packages

Bundle metrics   4 changes 1 regression

	Current #13974	Baseline #13968
Initial JS	45.67MiB(+0.06%)	45.64MiB
Initial CSS	0B	0B
Cache Invalidation	22.91%	21.53%
Chunks	30	30
Assets	33	33
Modules	4377(+0.05%)	4375
Duplicate Modules	519	519
Duplicate Code	31.63%(-0.03%)	31.64%
Packages	472	472
Duplicate Packages	70	70

Bundle size by type   2 changes 1 regression 1 improvement

	Current #13974	Baseline #13968
JS	62.52MiB (+0.05%)	62.5MiB
HTML	11.05KiB (-0.33%)	11.09KiB

Bundle analysis report Branch feat/test-grid-reparent Project dashboard

---

^{Generated by RelativeCI Documentation Report issue}