Fix : Prevents exceeding maxCount word limit in TextAera

[2nikhiltom]

Closes #16892

When the maxCount word limit is set along with enableCounter prop , users can bypass this limit by pressing the Enter key, allowing them to enter more words than specified in the next/new line.

This PR will not allow users to press Enter key once the max word limit is reached (like how space key is stoped)

Changelog

New

Adds a new condition for Enter key on onKeyDown function

Testing / Reviewing

Open deploy preview
Visit TextArea -playground storybook

Enable enableCounter prop
Set counterMode to word
Set maxCount to 5
Press Enter key and verify you should not be able to go to next line and type new words, and that word limit is not exceeded.

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[carbon-automation]

Hey there! v11.61.0 was just released that references this issue/PR.