Plugins: Add forward_host_env_vars setting (#79333)

* Plugins: Add forward_host_env_vars_plugins setting

* Renamed forward_host_env_vars_plugins to forward_host_env_vars

* Add readPluginIDsList

* refactoring

* lint

* Use util.SplitString

pkg/plugins/config/config.go

@@ -18,6 +18,7 @@ type Cfg struct {
 	PluginSettings       setting.PluginSettings
 	PluginsAllowUnsigned []string
 	DisablePlugins       []string
+	ForwardHostEnvVars   []string
 
 	// AWS Plugin Auth
 	AWSAllowedAuthProviders []string
@@ -52,7 +53,7 @@ type Cfg struct {
 func NewCfg(devMode bool, pluginsPath string, pluginSettings setting.PluginSettings, pluginsAllowUnsigned []string,
 	awsAllowedAuthProviders []string, awsAssumeRoleEnabled bool, awsExternalId string, azure *azsettings.AzureSettings, secureSocksDSProxy setting.SecureSocksDSProxySettings,
 	grafanaVersion string, logDatasourceRequests bool, pluginsCDNURLTemplate string, appURL string, appSubURL string, tracing Tracing, features plugins.FeatureToggles, angularSupportEnabled bool,
-	grafanaComURL string, disablePlugins []string, hideAngularDeprecation []string) *Cfg {
+	grafanaComURL string, disablePlugins []string, hideAngularDeprecation []string, forwardHostEnvVars []string) *Cfg {
 	return &Cfg{
 		log:                     log.New("plugin.cfg"),
 		PluginsPath:             pluginsPath,
@@ -75,5 +76,6 @@ func NewCfg(devMode bool, pluginsPath string, pluginSettings setting.PluginSetti
 		Features:                features,
 		AngularSupportEnabled:   angularSupportEnabled,
 		HideAngularDeprecation:  hideAngularDeprecation,
+		ForwardHostEnvVars:      forwardHostEnvVars,
 	}
 }