Add sharding key to issue/jira/zentao tracker tables
What does this MR do and why?
This MR adds group_id/project_id/organization_id foreign keys to issue_tracker_data/jira_tracker_data/zentao_tracker_data in order to shard this table as part of Cells architecture. Now every time one of these integrations is created, the data_fields association should have appropriate sharding key set.
Note: data migration to backfill older records and set not null constraint is going to be done in the future MR(s).
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