DG-1682 - Use previous values for missing restrict option

[krsoninikhil]

If a restrict via lineage or restrict via hierarchy option is missing while updating the set classification, this will use the previously saved value. This is done to avoid bypassing the validation if setting the options one by one.

Type of change

• Bug fix (fixes an issue)
• New feature (adds functionality)

Checklists

Development

• Lint rules pass locally
• Application changes have been tested thoroughly
• Automated tests covering modified code pass

Security

• Security impact of change has been considered
• Code follows company security practices and guidelines

Code review

• Pull request has a descriptive title and context useful to a reviewer. Screenshots or screencasts are attached as necessary
• "Ready for review" label attached and reviewers assigned
• Changes have been reviewed by at least one other contributor
• Pull request linked to task tracker where applicable