refactoring some naming + adding tenantID

[patrickhuie19]

Numeric tenantID is used across the centralized services.

Aligns on naming from discussion started here:smartcontractkit/chainlink-common#2158 (comment)

Not used in prod or consumed anywhere yet; breaking changes have no impact.

...ID = one scalar string
...Identity = a struct grouping multiple dimensions

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	⏩ skipped	Jul 6, 2026, 6:57 PM