row: Add a check for integrity of neededValueColsByIdx in row fetcher #40844
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The panic #40410 arises when a value in neededValueColsByIdx is out of
bounds of the row buffer used in the fetcher. The length of the row
buffer is equal to the number of columns in the table, so this panic is
most likely caused by the neededValueColsByIdx containing an invalid
column ID. To guard against this / have more information about debugging
this in the future, we verify during fetcher setup that all the values
in neededValueColsByIdx are within range of the table's row buffer.
Fixes #40410.
Release justification: Low risk assertion of valid behavior.
Release note: None