Breaking: #78477 - FlashMessagesViewHelper no longer inherits from TagBasedViewHelper

See forge#78477

Description

The FlashMessagesViewHelper has been refactored and no longer inherits from the TagBasedViewHelper.

Impact

The FlashMessagesViewHelper outputs default context specific markup. Adding own classes or tag attributes is no longer possible.

Affected Installations

All installations using the FlashMessagesViewHelper with tag specific attributes.

Migration

Remove the tag specific attributes and style the default output. If you need custom output use the possibility to render FlashMessages yourself, for example:

<f:flashMessages as="flashMessages">
    <dl class="messages">
        <f:for each="{flashMessages}" as="flashMessage">
           <dt>CODE!! {flashMessage.code}</dt>
           <dd>MESSAGE:: {flashMessage.message}</dd>
        </f:for>
    </dl>
</f:flashMessages>
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