Describe the problem

Found by @yuzefovich here: #94388 (comment)

when committing the txn we issue EndTxnRequest in which we don't set Key nor EndKey. Then, in DistSender.Send we construct rs which covers all requests in the BatchRequest, and we end up with something like rs = roachpb.RSpan{keys.RKeyMin, keys.RKeyMax}

That span include keys outside of the tenant's keyspace. It violates the requirement that all KV requests emitted by a tenant should be bounded by that tenant's logical keyspace boundaries.

To Reproduce

See the linked issue.

Expected behavior

DistSender should truncate requests to the intersection with the tenant keyspace boundaries.

Jira issue: CRDB-23267

Epic CRDB-23344