v0.7.1: Improve upgrade process and ingress configuration

[emmanuelmathot]

Description

This PR introduces several improvements and fixes:

Breaking Changes

• Remove pathType and pathSuffix configurations in favor of controller-specific defaults

Added

• Add upgrade job to handle database permissions for migrations from pre-0.7.0 versions
• Add separate ingress configuration for STAC browser
• Support custom cluster naming via postgrescluster.name
• Add comprehensive upgrade documentation

Changed

• Improve Nginx and Traefik support with controller-specific rewrites
• Increase bootstrap job retry limit to 3 attempts
• Enhance secret handling with custom PostgreSQL cluster names
• Update documentation with detailed configuration options

Documentation Updates

• Added upgrade.md for version migration guidance
• Updated unified-ingress.md with new configuration details
• Updated configuration.md with comprehensive options
• Added upgrade notice to README.md

Migration Guide

Users upgrading from pre-0.7.0 versions should:

1. Read the upgrade guide (docs/upgrade.md)
2. Specify previousVersion during upgrade
3. Remove pathType/pathSuffix from ingress config

Testing Done

• Tested upgrade from 0.6.0
• Verified ingress configurations with both NGINX and Traefik
• Tested PostgreSQL cluster with custom names
• Validated all documentation changes

[batpad]

@emmanuelmathot the Ingress changes look really good to me! Unfortunately, I won't have the time to test these changes on the WRI eoapi-k8s deploy before I leave for vacation, so will only be able to test that mid-next week. But all the changes look great to me, thank you!

[pantierra]

LGTM