Update the style and behavior of the green notification box in the UI

[CopyDemon]

Fixes:

• Move the notification box to a smaller size and position it in the corner of the web page (currently centered).
• Update the animation duration.

Proposed changes:

The notification box in the UI draws too much attention. Adjust it to be smaller and less obtrusive.

Legal Acknowledgement

By contributing to this software project, I agree to the following terms and conditions for my contribution:

1. I agree my contributions are submitted under the license terms described in the LICENSE.txt file at the top level of this directory.
2. I represent I am authorized to make the contributions and grant the license. If my employer has rights to intellectual property that includes these contributions, I represent that I have received permission to make contributions and grant the required license on behalf of that employer.

[lbianchi-lbl]

• The CI failures are most likely unrelated to this PR
• We might want to wait and try re-running the failing jobs, possibly once Bumping the IDAES tag of Pyomo to check for issues idaes-pse#1523 has been merged into IDAES/idaes-pse:main

[CopyDemon]

Found error reason, in dev env pytest will shut down UI server immediately. Fixing that now