[Backport 5.3.9104] Notices: Add customization for background color, text color, and text position. #61915
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Closes #59751
variant
option for Notices. Defaults to default option for position.styleOverrides
option to Notices with three fields:This means in the site-config a user can now specify notices as:
resulting in the following notice
![CleanShot 2024-03-26 at 00 03 52@2x](https://private-user-images.githubusercontent.com/3949285/316677092-c618232c-830e-434b-933c-6ca72f57e1ee.png?jwt=eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.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.MvzVuhuDSihMh18vj9JBtliZ88appYWj0tEYc4fl9pE)
Test plan
Backport ccba7d4 from #61338