* MM-21368 Notify user when editing message that's too long
* Disable 'Save' button to prevent edits from being posted
* Display error message specific to the message size and allows max, instead of the current, default "Invalid Message" error.
* Split message length error into text (left justified) and counts (right justified)
UX guidance from PR review
* UX Review: Wrap for longer error text + spacing adjustment
* UX Review: Align split messages to top + add spacing in-between
* UX Review: Align error message box padding with content
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