Breaking: #78477 - Remove method FlashMessage->getMessageAsMarkup() 

See forge#78477

Description 

The method FlashMessage->getMessageAsMarkup() has been removed.

Impact 

Using this method will stop working immediately.

Affected Installations 

All installations using the mentioned method above.

Migration 

Use the new FlashMessageRendererResolver::class, for example:

GeneralUtility::makeInstance(FlashMessageRendererResolver::class)->resolve()->render()

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