fix: move tg_connect to general, rustfmt upstream, fix UpstreamManager::new tests

- Relocate tg_connect from [timeouts] to [general] with validation and docs updates.
- Apply rustfmt to per-attempt upstream connect timeout expression in upstream.rs.
- Pass tg_connect_timeout_secs in all UpstreamManager::new test call sites.
- Wire hot reload and runtime snapshot to general.tg_connect.

src/proxy/tests/client_clever_advanced_tests.rs

@@ -94,6 +94,7 @@ async fn adversarial_tls_handshake_timeout_during_masking_delay() {
             1,
             1,
             1,
+            10,
             1,
             false,
             stats.clone(),
@@ -141,6 +142,7 @@ async fn blackhat_proxy_protocol_slowloris_timeout() {
             1,
             1,
             1,
+            10,
             1,
             false,
             stats.clone(),
@@ -193,6 +195,7 @@ async fn negative_proxy_protocol_enabled_but_client_sends_tls_hello() {
             1,
             1,
             1,
+            10,
             1,
             false,
             stats.clone(),
@@ -239,6 +242,7 @@ async fn edge_client_stream_exactly_4_bytes_eof() {
             1,
             1,
             1,
+            10,
             1,
             false,
             stats.clone(),
@@ -282,6 +286,7 @@ async fn edge_client_stream_tls_header_valid_but_body_1_byte_short_eof() {
             1,
             1,
             1,
+            10,
             1,
             false,
             stats.clone(),
@@ -328,6 +333,7 @@ async fn integration_non_tls_modes_disabled_immediately_masks() {
             1,
             1,
             1,
+            10,
             1,
             false,
             stats.clone(),