docs: update ingress control example in doc

[sushant-suse]

Which issue(s) this PR fixes:

Issue 12252

What this PR does / why we need it:

It updates the Longhorn UI access documentation to be ingress-agnostic. It refactors the Basic Auth guide to remove a hard dependency on ingress-nginx as the sole example, allowing for better compatibility with other controllers like Traefik.

Special notes for your reviewer:

The instructions have been generalized, and the Nginx-specific verification logs have been replaced with standard HTTP response codes. I have also added a specific reference to the Helm values.yaml for Ingress configuration as recommended.

Additional documentation or context:

N/A

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[derekbit]

The original intent of the ticket is to clarify that switching Ingress controllers (e.g. ingress-nginx to Traefik) does not affect Longhorn backend components, and that only the Longhorn UI ingress needs to be reconfigured. Making the document more controller-agnostic. And, the original Basic Auth guide can be an example.

[derekbit]

@sushant-suse Can you consolidate the commits? Focus on the v1.11.0 and port it to v1.10.x and v1.9.x later.

[derekbit]

In addition, need to mentioned https://kubernetes.io/blog/2025/11/11/ingress-nginx-retirement/ in the PR.

[derekbit]

Please consolidate the commits

[derekbit]

Please check #1275 (comment). The latest PR doesn't address the comment.

[Copilot]

Pull request overview

This PR updates the Longhorn UI access documentation to be more ingress controller-agnostic by adding notes about the ingress-nginx controller retirement and clarifying that the choice of Ingress controller doesn't affect Longhorn's core functionality.

Key changes:

• Added deprecation notices referencing a November 2025 Kubernetes announcement about ingress-nginx retirement
• Added clarifying note that Ingress controller choice only affects UI access, not Longhorn backend operations
• Minor formatting improvements (blank lines before References section)

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated 1 comment.

File	Description
content/docs/1.11.0/deploy/accessing-the-ui/longhorn-ingress.md	Added deprecation notice for ingress-nginx and formatting improvement
content/docs/1.11.0/deploy/accessing-the-ui/_index.md	Added notes about Ingress controller impact and ingress-nginx retirement
content/docs/1.10.1/deploy/accessing-the-ui/longhorn-ingress.md	Minor formatting fix (blank line before References)

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[derekbit]

LGTM