Fix: import command to honor --microcksURL without login

[Syedowais312]

Summary

This updates microcks import to use the shared command client setup already used by import-dir, service, and test.

Previously, microcks import --microcksURL ... still required local config/login unless Keycloak client credentials were also provided. This was inconsistent with import-dir and broke local latest-native usage where Keycloak is disabled.

Changes

• Reuse newCommandClient(globalClientOpts) in the import command.
• Preserve --watch context selection by falling back to the current config context, then the provided server URL.
• Add a regression test verifying import --microcksURL --config <empty> reaches the artifact upload endpoint.

Verification

go test ./cmd
go test ./...

fix: #511

[Syedowais312]

cc: @Vaishnav88sk @Harsh4902 @lbroudoux

[github-actions]

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[Harsh4902]

@Syedowais312 Please again take a look on this PR. Need some work as new changes are there in the code for Microcks client.

[Syedowais312]

@Harsh4902 I rebased the PR onto the latest master and have kept all the original changes, and pushed the updated branch. It now uses the latest Microcks client changes.