Text cells in grid component are not rendered in mobile viewport

### Description of the bug

Text cells are not rendered in the new grid component when it is displayed as a table in mobile viewport.

This happens because of `nodesFromGrid` is called in mobile viewport and it skips cells that contains text. See image below.
A possible solution is to use paragraph components instead, but this is probably not an optimal solution since text cells works in desktop view?


### Steps To Reproduce

1. Create the new grid component with text-cells.
2. Limit the width to less than 765px.
3. The component acts as a table now and does not display the text cells.

### Additional Information

Conversation with SSB about this:
https://altinn.slack.com/archives/C02EVE4RU82/p1683103041485429

Start with the nodesFromGrid call used when the grid switches to table layout below 765px, then reproduce the issue with a new grid containing text cells. Trace why text cells are skipped in the mobile viewport and verify that the text is rendered while desktop behavior remains unchanged.

Written by the indexing model from the issue text.