fix missing namespace during chart install

[keithpine]

Description

Fixes a regression where installing the Helm charts into a non-default namespace fails.

The cortx-platform chart was previously creating the namespace automatically. That chart was removed for CORTX-30141, but no change was added to create the namespace elsewhere.

Type of change

• Bug fix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds new functionality)
• Breaking change (bug fix or new feature that breaks existing functionality)
• Third-party dependency update
• Documentation additions or improvements
• Code quality improvements to existing code or test additions/updates

Applicable issues

• This change is related to an issue: CORTX-30141: Merge cortx-platform Chart into cortx Chart #245

How was this tested?

Deployed without the namespace previously existing.

Checklist

• The change is tested and works locally.
• New or changed settings in the solution YAML are documented clearly in the README.md file.
• All commits are signed off and are in agreement with the CORTX Community DCO and CLA policy.

If this change addresses a CORTX Jira issue:

• The title of the PR starts with the issue ID (e.g. CORTX-XXXXX:)

[osowski]

lgtm