## Problem
TenantId is changing to TenantShardId in many APIs. The swagger had
`format: hex` attributes on some of these IDs. That isn't formally
defined anywhere, but a reasonable person might think it means "hex
digits only", which will no longer be the case once we start using
shard-aware IDs (they're like `<tenant_id>-0001`).
## Summary of changes
- Remove these `format` attributes from all `tenant_id` fields in the
swagger definition
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