[bitnami/harbor] made generating existing/default secret secrets an option

[cthtrifork]

Description of the change

This adds an option to disable generation of templated secrets. Default is set to true to keep current behaviour intact.

Benefits

We have several scanners, such as polaris which is picking up that secrets are created by the chart. We are using external-secrets and want to create all secrets out of band.

Possible drawbacks

Applicable issues

• fixes [harbor] Allow providing all secrets out-of-band #25399

Additional information

Checklist

• Chart version bumped in Chart.yaml according to semver. This is not necessary when the changes only affect README.md files.
• Variables are documented in the values.yaml and added to the README.md using readme-generator-for-helm
• Title of the pull request follows this pattern [bitnami/<name_of_the_chart>] Descriptive title
• All commits signed off and in agreement of Developer Certificate of Origin (DCO)