Add accessibility test

[davidnixon]

Many components need a basic accessibility test. See guidance

Add accessibility test (not all at once). Either create a work item or reference this issue.

Let's start with these components for Accessibility tests:

• CvHeaderGlobalAction
• CvFileUploader
• CvButtonSet
• CvMultiSelect
• CvLink
• CvList
• CvCheckbox
• CvTextArea
• CvTextInput
• CvRadioButton
• CvRadioGroup

[halivert]

May I take CvLink one?

[github-actions]

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