Replace isahc with async ureq (#18414)

REplace isahc with ureq everywhere gpui is used.

This should allow us to make http requests without libssl; and avoid a
long-tail of panics caused by ishac.

Release Notes:

- (potentially breaking change) updated our http client

---------

Co-authored-by: Mikayla <mikayla@zed.dev>

crates/http_client/src/http_client.rs

@@ -11,13 +11,21 @@ use http::request::Builder;
 #[cfg(feature = "test-support")]
 use std::fmt;
 use std::{
-    sync::{Arc, Mutex},
+    sync::{Arc, LazyLock, Mutex},
     time::Duration,
 };
 pub use url::Url;
 
+#[derive(Clone)]
 pub struct ReadTimeout(pub Duration);
-#[derive(Default, Debug, Clone)]
+impl Default for ReadTimeout {
+    fn default() -> Self {
+        Self(Duration::from_secs(5))
+    }
+}
+
+#[derive(Default, Debug, Clone, PartialEq, Eq, Hash)]
+
 pub enum RedirectPolicy {
     #[default]
     NoFollow,
@@ -26,6 +34,23 @@ pub enum RedirectPolicy {
 }
 pub struct FollowRedirects(pub bool);
 
+pub static TLS_CONFIG: LazyLock<Arc<rustls::ClientConfig>> = LazyLock::new(|| {
+    let mut root_store = rustls::RootCertStore::empty();
+
+    let root_certs = rustls_native_certs::load_native_certs();
+    for error in root_certs.errors {
+        log::warn!("error loading native certs: {:?}", error);
+    }
+    root_store.add_parsable_certificates(&root_certs.certs);
+
+    Arc::new(
+        rustls::ClientConfig::builder()
+            .with_safe_defaults()
+            .with_root_certificates(root_store)
+            .with_no_client_auth(),
+    )
+});
+
 pub trait HttpRequestExt {
     /// Set a read timeout on the request.
     /// For isahc, this is the low_speed_timeout.