Paste into grid

[ruggi]

Problem:

Pasting an element into a grid doesn't place the new element into the grid's placement logic.

Fix:

If the target parent is a grid, remove flow properties from the pasted element, which will be then placed at the first valid coordinates following auto logic.

In the future we might revisit this with a bit more heuristics to determine "empty" cells to place the element into, but for now the current logic should be more than enough.

Before	After

Manual Tests:
I hereby swear that:

• I opened a hydrogen project and it loaded
• I could navigate to various routes in Preview mode

Fixes #6253

[github-actions]

Try me

[relativeci]

#13901 Bundle Size — 62.49MiB (~+0.01%).

a46519a(current) vs 916e8b9 master#13898(baseline)

Warning

Bundle contains 70 duplicate packages – View duplicate packages

Bundle metrics   3 changes 1 regression

	Current #13901	Baseline #13898
Initial JS	45.63MiB(~+0.01%)	45.63MiB
Initial CSS	0B	0B
Cache Invalidation	21.53%	21.5%
Chunks	30	30
Assets	33	33
Modules	4373	4373
Duplicate Modules	519	519
Duplicate Code	31.64%(-0.03%)	31.65%
Packages	472	472
Duplicate Packages	70	70

Bundle size by type   2 changes 1 regression 1 improvement

	Current #13901	Baseline #13898
JS	62.48MiB (~+0.01%)	62.48MiB
HTML	11.05KiB (-0.33%)	11.09KiB

Bundle analysis report Branch feat/paste-into-grid Project dashboard

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