fix(HeaderActionPanel): remove unnecessary aria-label

Summary

Change List (commits, features, bugs, etc)

Acceptance Test (how to verify the PR)

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Run IBM Accessibility Checker
Verify no error in The ARIA attributes 'aria-label' are not valid for the element <div> with implicit ARIA role 'generic'

Regression Test (how to make sure this PR doesn't break old functionality)

Things to look for during review

[ ] Make sure all references to iot or bx class prefix is using the prefix variable
[ ] (React) All major areas have a data-testid attribute. New test ids should have test written to ensure they are not changed or removed.
[ ] UI should be checked in RTL mode to ensure the proper handling of layout and text.
[ ] All strings should be translatable.
[ ] The code should pass a11y scans (The storybook a11y knob should show no violations). New components should have a11y test written.
[ ] Unit test should be written and should have a coverage of 90% or higher in all areas.
[ ] All components should be passing visual regression test. For new styles or components either a visual regression test should be written for all permutations or the base image updated.
[ ] Changes or new components should either write new or update existing documentation.
[ ] PR should link and close out an existing issue

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carbon-design-system / carbon-addons-iot-react