feat(agent): auto-detect proxy setup when fetching productinfo.htm (#1420)

Look in environment variables to set HTTP, HTTPS or SOCKS proxies.

Issue: DGW-291

Author: CBenoit

devolutions-agent/Cargo.toml

@@ -56,7 +56,7 @@ features = [
 [target.'cfg(windows)'.dependencies]
 hex = "0.4"
 notify-debouncer-mini = "0.6"
-reqwest = { version = "0.12", default-features = false, features = ["rustls-tls-native-roots"] }
+reqwest = { version = "0.12", default-features = false, features = ["rustls-tls-native-roots", "http2", "system-proxy", "socks"] }
 aws-lc-rs = "1.13"
 sha2 = "0.10"
 thiserror = "2"