Fix incorrect nullability reporting in Presto JDBC metadata

[srameshkanna]

Description

While inspecting columns to identify which ones support null values and which ones do not . presto unable to distinguish between them due to hardcoded metadata for all column.so added fix for that.

Motivation and Context

Issue: #11510

Impact

Incorrect Hive table column nullability reporting by the Presto JDBC driver led to inconsistent schema handling and query planning .

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[linux-foundation-easycla]

• ✅login: srameshkanna / (a3e4364)

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[ClarenceThreepwood]

Could you please add a unit test?