[feature] Parse content warning to HTML, serialize via client API as plaintext (#3876)

* [feature] Parse content warning as HTML, serialize via API to plaintext

* tidy up some cruft

* whoops

* oops

* i'm da joker baybee

* clemency muy lorde

* rename some of the text functions for clarity

* jiggle the opts

* fiddle de deee

* hopefully the last test fix i ever have to do in my beautiful life

internal/processing/status/delete.go

@@ -50,6 +50,13 @@ func (p *Processor) Delete(ctx context.Context, requestingAccount *gtsmodel.Acco
 		return nil, errWithCode
 	}
 
+	// Replace content warning with raw
+	// version if it's available, to make
+	// delete + redraft work nicer.
+	if targetStatus.ContentWarningText != "" {
+		apiStatus.SpoilerText = targetStatus.ContentWarningText
+	}
+
 	// Process delete side effects.
 	p.state.Workers.Client.Queue.Push(&messages.FromClientAPI{
 		APObjectType:   ap.ObjectNote,