[SPARK-15154] [SQL] Change key types to Long in tests

## What changes were proposed in this pull request?

As reported in the Jira the 2 tests changed here are using a key of type Integer where the Spark sql code assumes the type is Long. This PR changes the tests to use the correct key types.

## How was this patch tested?

Test builds run on both Big Endian and Little Endian platforms

Author: Pete Robbins <robbinspg@gmail.com>

Closes #13009 from robbinspg/HashedRelationSuiteFix.