Auto merge of #16750 - Veykril:unnecessary-else, r=Veykril

minor: Mark remove_unnecessary_else as experimental

cc #16566 (comment) #16628

There seem to be some leftover issues with this, additionally its a style lint so it's not too nice to see for some people. We should flesh out our diagnostics stuff before adding more style lints I think

crates/ide-diagnostics/src/handlers/remove_unnecessary_else.rs

@@ -30,6 +30,7 @@ pub(crate) fn remove_unnecessary_else(
         "remove unnecessary else block",
         display_range,
     )
+    .experimental()
     .with_fixes(fixes(ctx, d))
 }