Security update messages appear in modals

[jenlampton]

Description of the bug

Messages are appearing in modals instead of on the page behind.

With something like the "update available" message that appears on every page, this makes many modals unusable because the submit buttons are now below the "fold" of the page.

Steps To Reproduce

To reproduce the behavior:

1. Update to 1.24.1 (but not 1.24.2)
2. Run con or check update status to generate the red warning message.
3. Attempt to add a filter to the user/account admin listing

Actual behavior

Update message appears on modal, partially causing it to be unusable.

Expected behavior

Update message should not appear on every modal.

potential solutions

• Don't print the available update message on every page, we have the red dot now that should be sufficient.
• Adjust the modal positioning when a message is present, to ensure that the whole modal is visible
• Decrease whitespace around modal messaging (prob not enough on it's own)
• This may also be solved by [UX] Regression: Views dialogs are rendered partially off-screen and submit buttons are unreachable  #6076

Additional information

Add any other information that could help, such as:

• Backdrop CMS version: 1.24.1