fix(tabs): basic keyboard navigation

[IgnacioBecerra]

Related Ticket(s)

#970

Description

This PR ensures that the Tabs and Content Switcher components are able to be work with tab navigation.

Changelog

New

• added tab-index in the tab shadow dom

Changed

• triggering the content switching upon pressing the enter key

Removed

• remove unneeded inFocus property in the tab item component

[ibmdotcom-bot]

Deploy preview created for Carbon Web Components - Vue:
https://carbon-web-components-vue.s3.us-east.cloud-object-storage.appdomain.cloud/deploy-previews/992/index.html

Built with commit: 2f1cf465db992d795b59a7a2ca74204936c3ef9d

[ibmdotcom-bot]

Deploy preview created for Carbon Web Components:
https://carbon-web-components.s3.us-east.cloud-object-storage.appdomain.cloud/deploy-previews/992/index.html

Built with commit: 2f1cf465db992d795b59a7a2ca74204936c3ef9d

[ibmdotcom-bot]

Deploy preview created for Carbon Web Components - React:
https://carbon-web-components-react.s3.us-east.cloud-object-storage.appdomain.cloud/deploy-previews/992/index.html

Built with commit: 2f1cf465db992d795b59a7a2ca74204936c3ef9d

[ibmdotcom-bot]

Deploy preview created for Carbon Web Components - Angular:
https://carbon-web-components-angular.s3.us-east.cloud-object-storage.appdomain.cloud/deploy-previews/992/index.html

Built with commit: 2f1cf465db992d795b59a7a2ca74204936c3ef9d

[kennylam]

@IgnacioBecerra once #980 is complete we can also incorporate home/end interactions. See #707.