fix(go): update NewCfg to return error for better error handling

[manusa]

No description provided.

[Copilot]

Pull Request Overview

This PR improves error handling in the Helm package by updating the NewCfg function to return an error instead of using panic-based error handling. This change makes errors more explicit and easier to handle gracefully.

Key Changes:

• Modified NewCfg to return (*action.Configuration, error) instead of just *action.Configuration
• Replaced panic calls with proper error returns using fmt.Errorf with error wrapping
• Updated all call sites across 9 files to handle the returned error
• Added comprehensive test coverage for error scenarios

Reviewed Changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
native/internal/helm/helm.go	Updated NewCfg function signature to return error; replaced panics with proper error returns
native/internal/helm/upgrade.go	Added error handling for NewCfg call
native/internal/helm/uninstall.go	Added error handling for NewCfg call
native/internal/helm/test.go	Added error handling for NewCfg call
native/internal/helm/show.go	Added error handling for NewCfg call
native/internal/helm/registry.go	Added error handling for NewCfg calls in both login and logout functions
native/internal/helm/push.go	Added error handling for NewCfg call
native/internal/helm/list.go	Added error handling for NewCfg call
native/internal/helm/install.go	Added error handling for NewCfg call
native/internal/helm/plugins_test.go	Updated 5 test cases to handle NewCfg error return
native/internal/helm/helm_test.go	Updated existing test and added new tests for invalid kubeconfig scenarios

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