Enhancement: support multiple instance annotation for Kubernetes Automatic Service Discovery

[aldycool]

Proposed change

This is an added feature to allow Kubernetes Ingresses to have multiple instance annotations, so this make it possible to show a single Ingress to a selected Homepage instances. The code change is very minimal and does not introduce breaking changes, and I already update the Kubernetes configuration documentation on how to use this feature.

This is very similar to issue #2340 which solved this problem for Docker, while this PR is for Kubernetes.

Type of change

• [ ] New service widget
• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Documentation only
• [ ] Other (please explain)

Checklist:

• [x] If applicable, I have added corresponding documentation changes.
• [x] If applicable, I have reviewed the feature and / or service widget guidelines.
• [x] I have checked that all code style checks pass using pre-commit hooks and linting checks.
• [ ] If applicable, I have tested my code for new features & regressions on both mobile & desktop devices, using the latest version of major browsers.

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