Fix issue when a Helm create user job returns more than once

[jhaynie]

Description

This fix will correct a crash in the Helm Job when a user already exists.

Motivation and Context

If you re-run the helm chart reinstall (for example from ArgoCD), will fail on a re-sync because the user already exists and the $USER variable is only set the first pass through.

How to test this PR?

Install the Helm chart more than once

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Documentation updated
• Unit tests added/updated

[minio-trusted]

Mint Automation

Test	Result
mint-large-bucket.sh	✔️
mint-fs.sh	✔️
mint-gateway-s3.sh	✔️
mint-erasure.sh	✔️
mint-dist-erasure.sh	✔️
mint-compress-encrypt-dist-erasure.sh	✔️
mint-pools.sh	✔️
Deleting image on docker hub
Deleting image locally