[MM-19711] - Get plugin configuration without removing secrets (#11928)

* Method GetUnsanitizedConfig() exposed to API (Plugin) interface and his implementations

* improvements with some suggestions

* Fix documentation (final period added)

Co-Authored-By: Ali Farooq <25732808+ali-farooq0@users.noreply.github.com>

* Added some test for Plugin.GetConfig and Plugin.GetUnsanitizedConfig

* Removed empty lines

app/plugin_api.go

@@ -81,6 +81,11 @@ func (api *PluginAPI) GetConfig() *model.Config {
 	return api.app.GetSanitizedConfig()
 }
 
+// GetUnsanitizedConfig gets the configuration for a system admin without removing secrets.
+func (api *PluginAPI) GetUnsanitizedConfig() *model.Config {
+	return api.app.Config().Clone()
+}
+
 func (api *PluginAPI) SaveConfig(config *model.Config) *model.AppError {
 	return api.app.SaveConfig(config, true)
 }