[AVT] - Added Keyboard Nav AVT test for ComboButton

[guidari]

Closes #14680

Added keyboard navigation to ComboButton component.

Changelog

New

• Added new file e2e/components/ComboButton/ComboButton-test.avt.e2e.js

Testing / Reviewing

• Ensure the test pass.
• Ensure that the expected navigation is covered.

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[andreancardona]

looks good!

[carbon-automation]

Hey there! v11.39.0 was just released that references this issue/PR.