backend: Fixed ignored k8cache error handling

[greedy-wudpeckr]

Summary

This PR fixes ignored k8cache error handling

Related Issue

Fixes #4509

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[illume]

Can you please update the commit message? Have a look a the git commit guidelines in the contribution guide, and look at other git messages with git log.

It should be something closer to this:

backend: server: Fix ignored k8cache error handling

Also, please remove the signed-off-by? In this repo we don't need it as we use the CLA check. Thanks!

[Copilot]

Pull request overview

This PR addresses error handling for the k8cache authentication error response function. Previously, the error returned by ReturnAuthErrorResponse was explicitly ignored, which could lead to silent failures when attempting to send authentication error responses to clients.

Changes:

• Replaced ignored error assignment with proper error handling for k8cache.ReturnAuthErrorResponse

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[greedy-wudpeckr]

done PTAL @illume

[upsaurav12]

can you confirm that this is not causing any lint error?.
the error was ignored to not showing lint error