Use global MarkupFormatter in ScriptlerManagement

[strangelookingnerd]

This change introduces a saver and more consistent behavior when sanitizing / formatting texts.
Plugins should not need to by-pass the global MarkupFormatter.

This can be considered a breaking change in case users relied on RawHtmlMarkupFormatter to format the texts and have a different global MarkupFormatter (e.g. EscapedMarkupFormatter) configured.

Testing done

Added tests to show that texts are properly escaped using the global MarkupFormatter.

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