feat(feature): resolve legacy IDs during dependency resolution

[skevetter]

Summary

Implements legacy ID lookup during feature dependency resolution. When a feature's dependsOn references an old/legacy ID that no longer exists as a primary feature, the resolver now checks the legacyIds field of all known features to find the current feature that owns that legacy alias. This prevents resolution failures when features are renamed while maintaining backward compatibility through their legacyIds declarations.

• Adds buildLegacyIDMap() helper that maps each legacy ID to its current feature's ConfigID
• Integrates legacy lookup into resolveFeatureDependency() between the primary lookup and the fetch attempt
• Includes unit tests for the map builder and resolution logic
• Adds E2E testdata and test case for legacy ID resolution via dependsOn

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⚙️ Run configuration

Configuration used: Organization UI

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Run ID: f356d82a-f30a-40f5-88d1-bcf6acd3a354

📥 Commits

Reviewing files that changed from the base of the PR and between d2ca833 and c53a6c7.

📒 Files selected for processing (9)

• cmd/runusercommands.go
• e2e/tests/up-features/testdata/docker-features-legacy-id-resolution/.devcontainer.json
• e2e/tests/up-features/testdata/docker-features-legacy-id-resolution/features/consumer-feature/devcontainer-feature.json
• e2e/tests/up-features/testdata/docker-features-legacy-id-resolution/features/consumer-feature/install.sh
• e2e/tests/up-features/testdata/docker-features-legacy-id-resolution/features/current-feature/devcontainer-feature.json
• e2e/tests/up-features/testdata/docker-features-legacy-id-resolution/features/current-feature/install.sh
• e2e/tests/up-features/up_features.go
• pkg/devcontainer/feature/extend.go
• pkg/devcontainer/feature/extend_test.go

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