Revert "client: Add support for HTTP/HTTPS proxy" (#30979)

Reverts zed-industries/zed#30812

This PR broke nightly builds on linux by adding an OpenSSL dependency to
the `remote_server` binary, which failed to link when building against
musl.

Release Notes:

- N/A

Cargo.lock

@@ -2814,7 +2814,6 @@ dependencies = [
  "anyhow",
  "async-recursion 0.3.2",
  "async-tungstenite",
- "base64 0.22.1",
  "chrono",
  "clock",
  "cocoa 0.26.0",
@@ -2826,7 +2825,6 @@ dependencies = [
  "gpui_tokio",
  "http_client",
  "http_client_tls",
- "httparse",
  "log",
  "parking_lot",
  "paths",
@@ -2847,7 +2845,6 @@ dependencies = [
  "time",
  "tiny_http",
  "tokio",
- "tokio-native-tls",
  "tokio-socks",
  "url",
  "util",