3804 suite header and header action fix accessibility scan violations

Closes #GRAPHITE-64846

Summary

While running the a11y scan for TabListTemplate component in Graphite storybook following violations were found and this PR is to fix those accessibility scan violations.

Change List (commits, features, bugs, etc)

To fix violations removed role='menuitem' from HeaderActions which is used in <button /> and causing violations in a11y scans.

Acceptance Test (how to verify the PR)

Can be tested in storybook by running scan in Accessibility tab. Functionally Header and SuitHeader should work as before.

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