[BUG] test_conv_dec_to_from_hex for different datagen_seeds

[gerashegalov]

Describe the bug

[to_plus10-from_10] fails in CI for DATAGEN_SEED=1700253320

[2023-11-17T20:39:30.496Z] --- CPU OUTPUT
[2023-11-17T20:39:30.496Z] +++ GPU OUTPUT
[2023-11-17T20:39:30.496Z] @@ -1486,7 +1486,7 @@
[2023-11-17T20:39:30.496Z]  Row(a='608899526863483049', conv(a, 10, 10)='608899526863483049')
[2023-11-17T20:39:30.496Z]  Row(a='616420757253954442', conv(a, 10, 10)='616420757253954442')
[2023-11-17T20:39:30.496Z]  Row(a='435761768247103195', conv(a, 10, 10)='435761768247103195')
[2023-11-17T20:39:30.496Z] -Row(a='\x1f5¦½dÎà\x0b 9', conv(a, 10, 10)='0')
[2023-11-17T20:39:30.496Z] +Row(a='\x1f5¦½dÎà\x0b 9', conv(a, 10, 10)='5')
[2023-11-17T20:39:30.496Z]  Row(a='-272022217013155335', conv(a, 10, 10)='18174721856696396281')
[2023-11-17T20:39:30.496Z]  Row(a='180251617239943975', conv(a, 10, 10)='180251617239943975')
[2023-11-17T20:39:30.496Z]  Row(a='-3498518660140742', conv(a, 10, 10)='18443245555049410874')

we do not cover the full range of inputs conv, probably need to make a more accurate estimation of the max string length we support.

Environment details (please complete the following information)
multiple

Additional context