Add notification bar to the front end

[SAUMILDHANKAR]

Overview

This issue is a sub issue of issue #2326. In this issue we will create the notification bar to be added to the front end of the application.

Action Items

• Add the notification bar as per the design in the following comment Feature: Announcement bar (for holidays, emergencies, etc.) #2326 (comment).
• Once the PR associated with this issue is merged or this issue is closed, check issue Feature: Announcement bar (for holidays, emergencies, etc.) #2326, if all its sub-issues are marked complete, move that issue to the prioritized backlog column so someone can pick it up and check if that issue is complete or needs more work.

Resources/Instructions

• Helpful similar PRs 1983 UI for managing feature flags #2033, implement feature flag #2043