[VS Code] Bug: 'authentication-required' state causing status bar icon error

Problem to solve

When debugging VSCode and opening the "Webview Developer Tools" there is a consistent error logged to the devtools console:

TypeError: Cannot read properties of undefined (reading 'iconName')
    at CodeSuggestionsStatusBarItem.updateCodeSuggestionsItem (/home/elwyn/repos/editor-extensions/vscode-extension/src/common/code_suggestions/code_suggestions_status_bar_item.ts:69:62)

It seems we sometimes get an undefined value for newUiState:

const newUiState = CODE_SUGGESTIONS_STATUSES[state];

This is due to the state value being passed to updateCodeSuggestionsItem being 'authentication-required', which is not one of the options on the CODE_SUGGESTIONS_STATUSES record.

This means the status bar icon will not correctly display. Once a new state is passed, the status bar icon is correctly updated.

Proposed solution

Handle the authentication-required state so the correct icon is initially displayed