Improve Status Code Handling for Missing Resources

[philgenb]

Currently, the status codes used in various methods could be improved for better accuracy. For example, a 404 status code is often returned when a timesheet or similar resource is not found. However, since the operation was executed correctly, but no resource was found, a 204 (No Content) status code would be more appropriate.

Using 400-series status codes results in error messages in the console due to how the Axios package handles them, and these cannot be easily suppressed. This leads to unnecessary error logs for cases where the operation is successful but returns no content.