jira issue assignee

**Describe the bug**
in jira integration once configured all the issues appear with assigneed unassigned ; assignee should not be left unassigned and should be configurable while in jira integration

**To Reproduce**
Steps to reproduce the behavior:
1. Integrate jira with the deepfence console
2. run scan
3. and check the jira type that got raised look for assignee it stays unassigned

**Expected behavior**
A clear and concise description of what you expected to happen.

**Screenshots**
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**Components/Services affected**

- [ ] UI/Frontend
- [ ] API/Backend

**Additional context**
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