[charts/portal]Changes to support pod and container security context for Portal charts

[ksaladi]

Description of the change

• Changes to support Pod and Container securityContext at global and at each portal service level. This enables to support Redhat.

• To support the charts at OpenShift set the following in values.yaml

  global: podSecurityContext: fsGroup: runAsNonRoot: true runAsUser:

Benefits

Drawbacks

Applicable issues

• fixes #

Additional information

Checklist

• [x] Chart version bumped in Chart.yaml according to semver.
• [x] Variables are documented in the README.md
• [x] 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