refactor: streamline job status retrieval and clean up repository interface

- Simplified the job status retrieval process by consolidating logic into a single `getJobStatus` function.
- Removed redundant checks and methods from the `CustomJobRepositoryInterface` and `CustomJobRepository`.
- Updated the `getHorizonJobStatus` method in `ApplicationDeploymentQueue` to directly utilize the new `getJobStatus` function.
- Enhanced the `isThereAJobInProgress` method to improve clarity and maintainability.

app/Models/ApplicationDeploymentQueue.php

@@ -72,10 +72,6 @@ class ApplicationDeploymentQueue extends Model
 
     public function getHorizonJobStatus()
     {
-        if (! $this->horizon_job_id) {
-            return 'unknown';
-        }
-
         return getJobStatus($this->horizon_job_id);
     }