branch-4.1: [fix](be) Return null for TRY_CAST arithmetic overflow #67697 - #67985
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Problem Summary:
With enable_strict_cast=true, TRY_CAST of a DECIMAL(6,3) column
containing 123.456 to DECIMAL(4,2) fails the entire query with E-255.
TRY_CAST only classified INVALID_ARGUMENT as a recoverable conversion
failure, while decimal casts return ARITHMETIC_OVERFLOW_ERRROR.
Recognize arithmetic overflow in the shared batch and per-row error
classification so overflowing values become NULL and valid rows survive.
Child expression errors and ordinary CAST still propagate failures. Add
unit coverage for single-row and batch overflow with nullable and
non-nullable original cast results, plus child overflow propagation.
### What problem does this PR solve?
Issue Number: close #xxx
Related PR: #xxx
Problem Summary:
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Cherry-picked from #67697