refactor: simplify StopGracePeriod handling in container specifications

- Updated the handling of StopGracePeriod in various database builders to streamline the condition check, improving code readability and maintainability.

packages/server/src/utils/databases/postgres.ts

@@ -72,8 +72,7 @@ export const buildPostgres = async (postgres: PostgresNested) => {
 				Image: dockerImage,
 				Env: envVariables,
 				Mounts: [...volumesMount, ...bindsMount, ...filesMount],
-				...(StopGracePeriod !== undefined &&
-					StopGracePeriod !== null && { StopGracePeriod }),
+				...(StopGracePeriod && { StopGracePeriod }),
 				...(command
 					? {
 							Command: ["/bin/sh"],