Update plan text (#38731)

Release Notes:

- N/A

---------

Co-authored-by: David Kleingeld <davidsk@zed.dev>

crates/feature_flags/src/flags.rs

@@ -10,6 +10,10 @@ pub struct BillingV2FeatureFlag {}
 
 impl FeatureFlag for BillingV2FeatureFlag {
     const NAME: &'static str = "billing-v2";
+
+    fn enabled_for_all() -> bool {
+        true
+    }
 }
 
 pub struct NotebookFeatureFlag;