Bug: Cannot move cursor to end of RTL paragraph after DateTime node in Firefox

Lexical version: v0.34.0

## Steps To Reproduce

1. Write RTL text.
2. Insert a DateTime component.
3. Try to move selection to the end of the paragraph.

## The current behavior

Selection cannot be moved there.

## The expected behavior

Pressing the left arrow will eventually reach that location.

## Impact of fix
RTL users on Firefox.