Plugins: Refactor plugin config into separate env var and request scoped services (#83261)

* seperate services for env + req

* merge with main

* fix tests

* undo changes to golden file

* fix linter

* remove unused fields

* split out new config struct

* provide config

* undo go mod changes

* more renaming

* fix tests

* undo bra.toml changes

* update go.work.sum

* undo changes

* trigger

* apply PR feedback

pkg/services/pluginsintegration/pluginconfig/tracing_test.go

@@ -0,0 +1,50 @@
+package pluginconfig
+
+import (
+	"testing"
+
+	"github.com/grafana/grafana/pkg/setting"
+	"github.com/stretchr/testify/assert"
+	"github.com/stretchr/testify/require"
+)
+
+func TestNewTracingCfg(t *testing.T) {
+	t.Run("empty", func(t *testing.T) {
+		cfg := setting.NewCfg()
+
+		tracingCfg, err := newTracingCfg(cfg)
+		require.NoError(t, err)
+		assert.False(t, tracingCfg.IsEnabled(), "tracing should be disabled")
+		assert.Empty(t, tracingCfg.OpenTelemetry.Address)
+		assert.Empty(t, tracingCfg.OpenTelemetry.Propagation)
+	})
+
+	t.Run("enabled", func(t *testing.T) {
+		for _, tc := range []struct {
+			name        string
+			propagation string
+		}{
+			{"empty", ""},
+			{"jaeger", "jaeger"},
+			{"w3c", "w3c"},
+			{"multiple", "jaeger,w3c"},
+		} {
+			t.Run(tc.name, func(t *testing.T) {
+				const address = "127.0.0.1:4317"
+
+				cfg := setting.NewCfg()
+				otlpSect := cfg.Raw.Section("tracing.opentelemetry.otlp")
+				otlpSect.Key("address").SetValue(address)
+				if tc.propagation != "" {
+					otlpSect.Key("propagation").SetValue(tc.propagation)
+				}
+
+				tracingCfg, err := newTracingCfg(cfg)
+				require.NoError(t, err)
+				assert.True(t, tracingCfg.IsEnabled(), "tracing should be enabled")
+				assert.Equal(t, address, tracingCfg.OpenTelemetry.Address)
+				assert.Equal(t, tc.propagation, tracingCfg.OpenTelemetry.Propagation)
+			})
+		}
+	})
+}