Remove default value from topics sharding key

What does this MR do and why?

Remove default value from topics sharding key. All necessary changes are in place to ensure that organization is always present when managing topics.

This is part of the efforts of adding topics sharding key. Related MRs:

Step MR
1 Add sharding key tracking issues for groups_and_projects
2 Add organization id to topics
3 Change app and api to support organization id on topics
4 Uses organization id on Topics GraphQL
5 Update Projects Finder when finding by Topics
6 Remove the organization_id column default - this mr

Related #463254 (closed)

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