Plugins: Support for distributed tracing in backend plugins SDK (#63714)

* Tracing: Pass OTLP address and propagation format to plugins

* Fix unit tests

* Fix indentation

* Fix plugin manager integration tests

* Goimports

* Pass plugin version to plugins

* Do not add GF_PLUGIN_VERSION if plugin version is not set, add tests

* Allow disabling plugins distributed tracing on a per-plugin basis

* Moved disabled plugins to tracing.opentelemetry config section

* Pre-allocate DisabledPlugins map to the correct size

* Moved disable tracing setting flags in plugin settings

* Renamed plugin env vars for tracing endpoint and propagation

* Fix plugin initializer tests

* Refactoring: Moved OpentelemetryCfg from pkg/infra to pkg/plugins

* Changed GetSection to Section in parseSettingsOpentelemetry

* Add tests for NewOpentelemetryCfg

* Fix test case names in TestNewOpentelemetryCfg

* OpenTelemetry: Remove redundant error checks

pkg/api/plugin_resource_test.go

@@ -50,6 +50,7 @@ func TestCallResource(t *testing.T) {
 	require.NoError(t, err)
 
 	cfg := setting.NewCfg()
+
 	cfg.StaticRootPath = staticRootPath
 	cfg.IsFeatureToggleEnabled = func(_ string) bool {
 		return false
@@ -58,7 +59,9 @@ func TestCallResource(t *testing.T) {
 
 	coreRegistry := coreplugin.ProvideCoreRegistry(nil, &cloudwatch.CloudWatchService{}, nil, nil, nil, nil,
 		nil, nil, nil, nil, testdatasource.ProvideService(cfg, featuremgmt.WithFeatures()), nil, nil, nil, nil, nil, nil)
-	pCfg := config.ProvideConfig(setting.ProvideProvider(cfg), cfg)
+	var pCfg *config.Cfg
+	pCfg, err = config.ProvideConfig(setting.ProvideProvider(cfg), cfg)
+	require.NoError(t, err)
 	reg := registry.ProvideService()
 	cdn := pluginscdn.ProvideService(pCfg)
 	l := loader.ProvideService(pCfg, fakes.NewFakeLicensingService(), signature.NewUnsignedAuthorizer(pCfg),