[lexical-table] Bug Fix: Click and drag table selection in Firefox #7283
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Description
When clicking and dragging from a table cell in Firefox it seems that the pointer gets captured and the target never leaves the initial location. This refactors the LexicalTableSelectionHelpers mousemove handler to always use the event coordinates rather than the event target in Firefox.
Closes #7245
Test plan
Before
Clicking and dragging to create a table selection stopped updating very quickly, see #7245
After
Can click and drag to create a table selection in Firefox