[bitnami/minio] Fix MinIO Network Policy

[FawenYo]

Description of the change

This PR contains the following changes:

1. Add the missing extraIngress block in the MinIO network policy
2. Fix the extraEgress in MinIO so it can be properly set.

Benefits

Users can set their own network policy in MinIO.

Possible drawbacks

N/A

Applicable issues

• fixes #

Additional information

Checklist

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