Un-deprecate Transactional Macro (#11807)

* un-deprecate transactional macro

* add transactional back to nomination pools

substrate/frame/support/procedural/src/lib.rs

@@ -429,7 +429,6 @@ pub fn pallet(attr: TokenStream, item: TokenStream) -> TokenStream {
 /// }
 /// ```
 #[proc_macro_attribute]
-#[deprecated(note = "This is now the default behaviour for all extrinsics.")]
 pub fn transactional(attr: TokenStream, input: TokenStream) -> TokenStream {
 	transactional::transactional(attr, input).unwrap_or_else(|e| e.to_compile_error().into())
 }