Restore HTTP client transition, but use reqwest everywhere (#19055)

Release Notes:

- N/A

crates/extension_cli/Cargo.toml

@@ -18,14 +18,14 @@ clap = { workspace = true, features = ["derive"] }
 env_logger.workspace = true
 extension = { workspace = true, features = ["no-webrtc"] }
 fs.workspace = true
-isahc_http_client.workspace = true
 language.workspace = true
 log.workspace = true
+reqwest_client.workspace = true
 rpc.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 theme.workspace = true
-tokio.workspace = true
+tokio = { workspace = true, features = ["full"] }
 toml.workspace = true
 tree-sitter.workspace = true
 wasmtime.workspace = true