HTTP Client: Make ResponseHeaderTimeout default timeout in http client (#34597)

* HTTP Client: Add `ResponseHeaderTimeout` - split from `DialContext` timeout

* Fixes according to reviewer's comments

* Use grafana-plugin-sdk-go v0.100.0

pkg/setting/setting.go

@@ -78,6 +78,7 @@ var (
 	// HTTP server options
 	DataProxyLogging               bool
 	DataProxyTimeout               int
+	DataProxyDialTimeout           int
 	DataProxyTLSHandshakeTimeout   int
 	DataProxyExpectContinueTimeout int
 	DataProxyMaxIdleConns          int
@@ -823,7 +824,8 @@ func (cfg *Cfg) Load(args *CommandLineArgs) error {
 	// read data proxy settings
 	dataproxy := iniFile.Section("dataproxy")
 	DataProxyLogging = dataproxy.Key("logging").MustBool(false)
-	DataProxyTimeout = dataproxy.Key("timeout").MustInt(30)
+	DataProxyTimeout = dataproxy.Key("timeout").MustInt(10)
+	DataProxyDialTimeout = dataproxy.Key("dialTimeout").MustInt(30)
 	DataProxyKeepAlive = dataproxy.Key("keep_alive_seconds").MustInt(30)
 	DataProxyTLSHandshakeTimeout = dataproxy.Key("tls_handshake_timeout_seconds").MustInt(10)
 	DataProxyExpectContinueTimeout = dataproxy.Key("expect_continue_timeout_seconds").MustInt(1)