fix: libvirt instance rm error message (#435)

[poyrazK]

Summary

• Make removeInstanceContainer error messages backend-agnostic using s.compute.Type() instead of hardcoded "container"
• Follows the same pattern applied to StopInstance in PR fix: libvirt backend failures (#425, #427, #430, #431, #432) #484 (issue CLI instance stop fails for ALL instances - 'failed to stop container' #430)

Test plan

• go build ./... passes
• go test ./internal/core/services/... -run "Terminate" passes

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Fixes #435

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: c3c404d9-4c53-449e-b52b-9433ef43a8c7

📥 Commits

Reviewing files that changed from the base of the PR and between 5faabcc and 987be27.

📒 Files selected for processing (2)

• internal/core/services/instance.go
• internal/core/services/instance_unit_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/libvirt-instance-rm-435

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