APIs throwing 500 status when 4** is expected

**Describe the bug**
When trying to delete a non-existing workflow using `DELETE {{conductorBaseUrl}}/api/metadata/workflow/:name/:version` api
replies back with 500 status code.
```
{
"status": 500,
"message": "No such workflow definition: memes_maker version: 2",
"instance": "1a79daf01f84",
"retryable": false
}
```

**Details**
Conductor version: v3.19.0
Persistence implementation: Postgres
Queue implementation: Postgres
Lock: I guess redis

**To Reproduce**
Steps to reproduce the behavior:
1. Use API to delete non existing workflow
```
curl --location --request DELETE 'http://localhost8080/api/metadata/workflow/memes_maker/2'
```
2. See error

**Expected behavior**
Status code should be 404

**Additional context**
Same thing happens if we try to create existing workflow with existing version.