distsql: heterogeneous big endian - little endian clusters can produce incorrect results

[yuzefovich]

DistSQL machinery relies on having the same hash computation across all nodes in the distributed plan. As it turns out (see #146108), there is a difference at least for the hash utilities used by the vectorized engine between big endian and little endian systems. As a result, a heterogenous cluster that has nodes running on both big endian and little endian systems can produce incorrect results for distributed plans. A possible workaround if someone really needs this setup would be to disable distsql via SET CLUSTER SETTING sql.defaults.distsql = off;.

Jira issue: CRDB-51797