[bugfix][a11y] Label side pane tab header currently active tab as aria-label#3345

edwardlee-msft merged 4 commits intomainAzure/communication-ui-library:mainfrom

elee/bugfix-a11y-announce-side-pane-active-stateAzure/communication-ui-library:elee/bugfix-a11y-announce-side-pane-active-stateCopy head branch name to clipboard