feat: Switch from 'country' to 'location'

[craciunoiuc]

Use the 'x/iata' package for this.

Closes: TOOL-1150

[Copilot]

Pull request overview

This PR updates the CLI’s metro configuration and presentation to use an IATA-based location field instead of country, aligning metro metadata with the unikraft.com/x/iata package and propagating the rename through config parsing, CLI resources, tests, and CI.

Changes:

• Replace metro country with location across config models and CLI resource output.
• Normalize metro IATA codes when fetching metros from the control plane using unikraft.com/x/iata.
• Update unit/golden help fixtures and GitHub Actions integration config to use location.

Reviewed changes

Copilot reviewed 9 out of 10 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
internal/multimetro/client.go	Switches fetched metro metadata to populate Location and normalizes via x/iata.
internal/integration/config.go	Updates integration config shaping to set Metro.Location.
internal/config/profile.go	Renames the persisted metro field from Country to Location in the profile schema.
internal/config/config_test.go	Adds coverage around parsing location, missing location, and legacy country behavior.
internal/cmd/metros.go	Updates the metro resource fields/output to expose location instead of country.
go.mod	Adds dependency on unikraft.com/x/iata.
go.sum	Adds checksums for unikraft.com/x/iata.
cmd/unikraft/testdata/TestHelp/config	Updates golden help output field list from country to location.
cmd/unikraft/testdata/TestHelp/auth	Updates golden help output field list from country to location.
.github/workflows/test.yaml	Updates generated integration config snippets to use location.

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[craciunoiuc]

@jedevc We should discuss this:

Currently if no location is set the column will just not appear, so basically on output the metros will just not show the country anymore

Alternative to this is to support both for a while, but it's such a small change I'm not sure it makes sense to do