[Client Feedback] Add license as dropdown option in dataset custom metadata

[sagargg]

The current process for adding licenses for datasets involves manual entry into a custom metadata field, however the client has requested to change this to a dropdown option similar to what is available in the default CKAN.

replace to

Acceptance Criteria

• [ ] I can see the dropdown option is implemented on the license field while creating a new dataset.

Tasks

• [x] Implement
• [x] Deploy on staging and test
• [x] Get signoff from the client
• [x ] Deploy on the production ✅ 2023-02-20

[sagargg]

@SusanBot85 Once we implement this we can ask the client if we can deploy this along with #22 , #2.

[sagargg]

Deployed on both envrionment