[clr-interp] Array allocation exception has incorrect exception

[davidwrighton]

• The actual helper throws the right exception (which is OverflowException)
• Don't add an incorrect check

[Copilot]

Pull Request Overview

This PR fixes an exception handling issue in the CLR interpreter's array allocation code. The removed manual validation was throwing the wrong exception type (ArgumentOutOfRangeException) when it should throw OverflowException, which the underlying helper already correctly handles.

• Removes duplicate and incorrect exception checks for negative array lengths in INTOP_NEWARR and INTOP_NEWARR_GENERIC cases
• Relies on the helper function to throw the correct OverflowException instead

[janvorli]

LGTM, thank you!