Lucas BordeauandGitHub 2044be28ec Refactored z-index handling for hovered portal with a better UX (#14384)
This PR closes the first step of
https://github.com/twentyhq/core-team-issues/issues/1451, about z-index
fine-tuning on the table.

The core part was to succeed in having the hovered portal and the
surrounding cells switch their z-index to have the borders overlap
nicely in all scrolling cases.

See associated video for the new behavior.

This PR fixes two majors UX issues we had : 
- The sticky column and row were sliding a bit on the beginning of the
scroll
- Too many components were re-rendering while we only needed to isolate
those who presented a complex use case

In the end, we isolated some very specific components like the cell 0-0
and the first scrollable header cell, which were giving the most
problems with the hovered portal.

This allows to leave the rest of the cells and header cells alone with
those concerns because they weren't involved at all in z-index update,
once we isolated those components.

## Demo



https://github.com/user-attachments/assets/cbe630ed-63c3-4e86-a22e-a11662c6082c



https://github.com/user-attachments/assets/36e6947d-9f89-4ed2-ba6c-cbb13016d7d1
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