See slack thread for context: https://cockroachlabs.slack.com/archives/C0KB9Q03D/p1667393625502529

Today, each tenant's end key (in the range list) is the first key of the next tenant (i.e. the last key of tenant 10 is /tenant/30, if only tenants 10 and 30 are defined). For the the last tenant its end key is /Max.

We'd like all this to be /Tenant/<id>/<endprefix>.

This causes a few concerns around things like zone configs from the previous tenant temporarily leaking into a newly created tenant. This should be straightforward to address, so we should.

cc @knz @cockroachdb/multi-tenant

Jira issue: CRDB-21562

Epic CRDB-23344