Restrict v0.0.7 of the zed_extension_api to dev builds, for now (#12170)

This PR restricts usage of v0.0.7 of the `zed_extension_api` to dev
builds, for now.

As we're still making changes to it, we don't want to ship a version of
Zed to Preview/Stable that claims to support a yet-unreleased version of
the extension API.

Release Notes:

- N/A

crates/extension/src/wasm_host.rs

@@ -16,6 +16,7 @@ use gpui::{AppContext, AsyncAppContext, BackgroundExecutor, Task};
 use http::HttpClient;
 use language::LanguageRegistry;
 use node_runtime::NodeRuntime;
+use release_channel::ReleaseChannel;
 use semantic_version::SemanticVersion;
 use std::{
     path::{Path, PathBuf},
@@ -30,6 +31,7 @@ use wit::Extension;
 
 pub(crate) struct WasmHost {
     engine: Engine,
+    release_channel: ReleaseChannel,
     http_client: Arc<dyn HttpClient>,
     node_runtime: Arc<dyn NodeRuntime>,
     pub(crate) language_registry: Arc<LanguageRegistry>,
@@ -96,6 +98,7 @@ impl WasmHost {
             http_client,
             node_runtime,
             language_registry,
+            release_channel: ReleaseChannel::global(cx),
             _main_thread_message_task: task,
             main_thread_message_tx: tx,
         })
@@ -124,8 +127,13 @@ impl WasmHost {
                 },
             );
 
-            let (mut extension, instance) =
-                Extension::instantiate_async(&mut store, zed_api_version, &component).await?;
+            let (mut extension, instance) = Extension::instantiate_async(
+                &mut store,
+                this.release_channel,
+                zed_api_version,
+                &component,
+            )
+            .await?;
 
             extension
                 .call_init_extension(&mut store)