refactor: Allow isolated headlines/intros in the form (backport #31459) #31493
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Issue
show_message
groups all headlines passed to it and assumes the state of the last headlineYet they are grouped -> the intent is completely ignored -> the outcome isn't what was expected
An independently set headline can't stand out and the message is lost when grouped with another headline
Proposed Fix
Each attempt to

show_message
should be rendered as a separate block with its own color and close buttonRemoval affects the right headline

Headlines with HTML passed

Restructure:
.form-message-container
contains.form-message
blocksThis is an automatic backport of pull request #31459 done by [Mergify](https://mergify.com).