Fix ORM UPDATE..RETURNING cache adaptation with synchronize_session=fetch

Fix ORM UPDATE..RETURNING cache adaptation with synchronize_session=fetch

Fixed result-metadata corruption affecting ORM-enabled UPDATE statements
that use .returning() together with synchronize_session="fetch".  In this
configuration the RETURNING clause is rendered in mapper/table column order
rather than the user-requested .returning() order; on a compiled-cache hit,
the cursor result metadata was positionally adapted against the cached
statement's user-requested column order, causing column values to be
returned under the wrong keys (e.g. row[T.a] returning T.b's value).

The mis-adaptation was frequently masked by cached row-getter functions
produced by a prior, correctly-adapted execution, so the wrong values
surfaced most reliably under concurrent execution racing on the shared
compiled cache.  The fix disables result-set adapt_to_context for this
path, mirroring the ORM INSERT and ORM SELECT load paths, since the cached
keymap already carries the correct Column objects.

ORM DELETE statements are not affected: DELETE does not pass through
crud._get_crud_params() and therefore retains the user-requested RETURNING
order; a non-regression DELETE case is included in the test.

Fixes: #13439
Change-Id: If58e93a0bb3220dc5637bc7bcf346d2177529d6d