Create Banner in GE to alert users of Migration

[jessicaaawu]

Problem:
In April (exact date TBD), GE will migrate to Torus tenant and get a new app ID. All users, who wish to use GE as a logged in user, will need to 1) Re-login and 2) Re-consent to GE to access the users data.
This will cause a disruption for the user experience for GE and we need to widely communicate this to our users ahead of time.

Solution
A banner to be created within GE to alert them of: 1) the migration initiative, 2) the most important change/ action they will need to take (Reconsent) and 3) a link to learn more.

Feature spec

1. Placement: Place it by the top right side of GE so its visible and by the login
2. Background color: Yellow (to alert users, but not red which will make it look alarming)
3. Dimensions of banner: should follow other existing banners in GE
4. Have icon to signal an "alert" (announcement) --> have an exclamation mark in a circle (Elinor said this is possible with the Fluent UI)
5. Bold text Announcement:
6. Text: Announcement: On April 14th, all users will need to re-login to Graph Explorer and reconsent to permissions. Learn more about impacts of GE migration here.
7. Hyperlink and underline here to the public blog. (link will be supplied later)

Additional context
Text within the banner subjected to change. Link to blog will be supplied at a later date.