MM-45208: strip post meta for plugins (#20686)

Try two...

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

This reverts commit 32dee6d449.

* Fixed race condition

* PR feedback

* lint

model/post.go

@@ -736,18 +736,10 @@ func (o *Post) ToNilIfInvalid() *Post {
 	return o
 }
 
-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) ForPlugin() *Post {
+	p := o.Clone()
+	p.Metadata = nil
+	return p
 }
 
 func (o *Post) GetPreviewPost() *PreviewPost {