Integration config typed any

So that it's marshalled as "" empty string instead of "[]" that breaks the log config

pkg/fleet/installer/setup/common/config.go

@@ -162,7 +162,7 @@ type DatadogConfigInstallerRegistry struct {
 
 // IntegrationConfig represents the configuration for an integration under conf.d/
 type IntegrationConfig struct {
-	InitConfig []any                   `yaml:"init_config"`
+	InitConfig any                     `yaml:"init_config"`
 	Instances  []any                   `yaml:"instances,omitempty"`
 	Logs       []IntegrationConfigLogs `yaml:"logs,omitempty"`
 }