fix(material/chips): adds border on chip-action focus

[essjay05]

Updates Angular Material Chips component so that when mat-mdc-chip-action is focused on a border appears around either the text of the chip or the action icon, whichever is being focused. This improves the accessibility by aiding the user in seeing which element/action is being focused on.

Before fix screencast After fix screencast

Fixes b/286103414

[github-actions[bot]]

Deployed dev-app for 3a3a1ab933e572e587689f09165b7852dc24028f to: https://ng-dev-previews-comp--pr-angular-components-30961-dev-08azfdee.web.app

Note: As new commits are pushed to this pull request, this link is updated after the preview is rebuilt.

[adolgachev]

Closing in favor of https://github.com/angular/components/pull/31828

[angular-automatic-lock-bot[bot]]

This issue has been automatically locked due to inactivity. Please file a new issue if you are encountering a similar or related problem.

Read more about our automatic conversation locking policy.

_{This action has been performed automatically by a bot.}