Rename ZedHttpClient for clarity (#8320)

This PR renames the `ZedHttpClient` to `HttpClientWithUrl` to make it
slightly clearer that it still is holding a `dyn HttpClient` as opposed
to being a concrete implementation.

Release Notes:

- N/A

crates/feedback/src/feedback_modal.rs

@@ -299,7 +299,7 @@ impl FeedbackModal {
         let installation_id = telemetry.installation_id();
         let is_staff = telemetry.is_staff();
         let http_client = zed_client.http_client();
-        let feedback_endpoint = http_client.zed_url("/api/feedback");
+        let feedback_endpoint = http_client.build_url("/api/feedback");
         let request = FeedbackRequestBody {
             feedback_text: &feedback_text,
             email,