Allow subject_key to be set with a function

Lin Jen-Shinrequested to merge
fix-claim-rename-path into master

What does this MR do and why?

Allow subject_key to be set with a function

We need to load the value from the database because it's updated by a database trigger, so it's not visible in the code directly.

References

Fixes gitlab-com/gl-infra/tenant-scale/cells-infrastructure/team#607

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