[charts/portal ]Chart changes to upgrade the demo mysql chart to support mysql 8.4.4

[ksaladi]

Description of the change

1. New chart service name has been changed to "*-mysql-headless"
2. Also native_password support with legacy configuration is removed.
3. Followed as per the doc from https://github.com/bitnami/charts/tree/main/bitnami/mysql

Benefits

Drawbacks

Applicable issues

• fixes #

Additional information

Checklist

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