Refactor Method Name and Improve HTTP Header Handling in ServiceManager

[irfanghat]

Changes

• Renamed Method:

  • The method list_all_suspended_services has been renamed to list_services_with_status to better reflect its functionality of returning services based on their status, whether suspended or not.

• Updated Main Function:

  • Modified the call in main.rs to use the updated method name.

• Added Test Case:

  • Introduced a new test case test_list_services_with_status to validate the functionality of the renamed method.

• Header Constants:

  • Replaced string literals for HTTP headers with constants (ACCEPT, AUTHORIZATION, CONTENT_TYPE) in multiple places within service_manager.rs for consistency and maintainability.