sql: replace an internal error in EXPLAIN (DISTSQL) and EXPLAIN (VEC) #40803
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Currently, when we're explaining a query that has a subquery value
of which is needed to construct the physical plan, we error out with
an internal error. This commit replaces that stack trace with a more
user-friendly message saying that explaining such a query is not
supported.
Addresses: #40677.
Release justification: Category 2: Bug fixes and low-risk updates to
new functionality.
Release note: None