chore(module): fix lint and failed test

[danilrwx]

Description

Two small fixes to unblock CI:

• src/cli: check the return value of fmt.Fprintf in the VNC test to satisfy the errcheck linter.
• vm controller: update the migrating_test.go expectation to match the clearer condition wording introduced in fix(api): make user-facing condition messages clearer #2558 ("Migration is in progress: target pod is being scheduled.").

Why do we need it, and what problem does it solve?

The linter failed on internal/cmd/vnc/vnc_test.go (errcheck), and the migrating condition unit test broke after the user-facing message was reworded. Both kept the pipeline red without any functional regression.

What is the expected result?

1. task lint passes for ./src/cli.
2. go test ./pkg/controller/vm/internal/ passes.

Checklist

• The code is covered by unit tests.
• e2e tests passed.
• Documentation updated according to the changes.
• Changes were tested in the Kubernetes cluster manually.

Changelog entries

Not applicable — lint and test-only changes, no user-facing behavior change.