[charts/portal] ImagePullPolicy in Portal db upgrade jobs.

[ksaladi]

Description of the change

Introdcuing imagePullPolicy in Portal db upgrade jobs.

Benefits

To pull/use the image based on the value

Drawbacks

No

Checklist

• [x] Chart version bumped in Chart.yaml according to semver.
• [x] Variables are documented in the README.md
• [] Title of the PR starts with chart name (e.g. [charts/gateway])
• [x] If the chart contains a values-production.yaml apart from values.yaml, ensure that you implement the changes in both files