Disable Tombstone insertion in ResourceTable by default (#12114)

This was useful in the development of WASIp3 but given the relatively
big change in behavior to a foundational data structure I don't think
it's best to keep this tied to `cfg!(debug_assertions)`. Instead disable
it by default and use a source-editing approach to change it.

Author: alexcrichton

crates/wasmtime/src/runtime/component/resource_table.rs

@@ -62,6 +62,10 @@ impl Entry {
 
 struct Tombstone;
 
+// Change this to `true` to assist with handle debugging in development if
+// necessary.
+const DELETE_WITH_TOMBSTONE: bool = false;
+
 /// This structure tracks parent and child relationships for a given table entry.
 ///
 /// Parents and children are referred to by table index. We maintain the
@@ -311,7 +315,7 @@ impl ResourceTable {
     where
         T: Any,
     {
-        self.delete_maybe_debug(resource, cfg!(debug_assertions))
+        self.delete_maybe_debug(resource, DELETE_WITH_TOMBSTONE)
     }
 
     fn delete_maybe_debug<T>(