[SPARK-37590][SQL][TEST][FOLLOWUP] Use warehouse directory for namespace location

[imback82]

What changes were proposed in this pull request?

This is a follow up to address #34842 (comment), where setting /tmp as a namespace location may break certain test environments.

This PR also fixes a minor string interpolation issue (unnecessary s) in the same file.

Why are the changes needed?

To fix a test issue that the namespace location may cause in certain environments where /tmp is not accessible.

Does this PR introduce any user-facing change?

No

How was this patch tested?

Updated the test

[imback82]

cc @cloud-fan

[SparkQA]

Kubernetes integration test starting
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/50789/

[SparkQA]

Kubernetes integration test status failure
URL: https://amplab.cs.berkeley.edu/jenkins/job/SparkPullRequestBuilder-K8s/50789/

[SparkQA]

Test build #146316 has finished for PR 34930 at commit dc63822.

• This patch passes all tests.
• This patch merges cleanly.
• This patch adds no public classes.

[cloud-fan]

thanks, merging to master!