Revert "Removed the opengraph type dependency for plugins by stripping post Metadata (#20612)" (#20684)

This reverts commit da7a8a4552.

model/post.go

@@ -736,10 +736,18 @@ func (o *Post) ToNilIfInvalid() *Post {
 	return o
 }
 
-func (o *Post) ForPlugin() *Post {
-	p := o.Clone()
-	p.Metadata = nil
-	return p
+func (o *Post) RemovePreviewPost() {
+	if o.Metadata == nil || o.Metadata.Embeds == nil {
+		return
+	}
+	n := 0
+	for _, embed := range o.Metadata.Embeds {
+		if embed.Type != PostEmbedPermalink {
+			o.Metadata.Embeds[n] = embed
+			n++
+		}
+	}
+	o.Metadata.Embeds = o.Metadata.Embeds[:n]
 }
 
 func (o *Post) GetPreviewPost() *PreviewPost {