fix: replace silent return with os.Exit(1) on auth/config failures

[Priyanshubhartistm]

Problem

In cmd/test.go, cmd/import.go, cmd/importDir.go, and cmd/importURL.go, several error branches inside the local-config path used plain return statements instead of os.Exit(1):

• config.ReadLocalConfig() failure
• localConfig == nil (no login session)
• connectors.NewClient() failure
• ValidationError from ImportDirectory

Since Cobra treats a normal Run return as success, the process exited with status 0 even when auth/config initialization failed. This caused CI/CD pipelines to report false-positive success - the command printed an error message but the pipeline saw a green exit code and continued.

Changes

Replaced every silent return in these error branches with os.Exit(1) across all four affected files. No user-visible messages were changed.

Scenario	Before	After
Missing/corrupt config file	exit 0 ❌	exit 1 ✅
No login session (localConfig == nil)	exit 0 ❌	exit 1 ✅
NewClient() failure	exit 0 ❌	exit 1 ✅
ValidationError from ImportDirectory	exit 0 ❌	exit 1 ✅

Files Changed

• cmd/test.go
• cmd/import.go
• cmd/importDir.go
• cmd/importURL.go
  Fixes Bug: microcks test exits with status 0 on auth/config failure - pipelines silently report "passed" when the test never ran #361

[Harsh4902]

LGTM. Thanks @Priyanshubhartistm for contribution.

[github-actions]

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[Priyanshubhartistm]

@Harsh4902 Thank you so much for the review and merge