Add aria-expanded attribute to collapsed tabs

Closes #3432632

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• 166287ce - move aria-expanded attribute to the button element

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• 15ccac6b - use function value as value instead of condition

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resolved all threads

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• 6705fb16 - Add a Nightwatch test for Claro primary tabs by duplicating a test from Olivero

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• 2e713ebb - Install test site with Claro theme for Nightwatch tests

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closed