feat(config): support array form for extends property

[skevetter]

Summary

• The extends field now accepts both "path.json" (string) and ["a.json", "b.json"] (array) forms via a custom ExtendsRef type with JSON marshal/unmarshal
• Array refs are resolved left-to-right: each parent is merged on top of the previous, then the child config is merged last
• Includes unit tests for array single-ref, multi-ref, ordering semantics, cycle detection through array, and ExtendsRef marshal/unmarshal
• Adds E2E test validating array extends with read-configuration

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⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 8eb615a5-57a2-4412-95c8-6b92f7e60082

📥 Commits

Reviewing files that changed from the base of the PR and between b51dbf6 and b9bb8ae.

📒 Files selected for processing (8)

• e2e/tests/extends/extends.go
• e2e/tests/extends/testdata/array-extends/.devcontainer/base.json
• e2e/tests/extends/testdata/array-extends/.devcontainer/devcontainer.json
• e2e/tests/extends/testdata/array-extends/.devcontainer/middleware.json
• pkg/devcontainer/config/config.go
• pkg/devcontainer/config/extends.go
• pkg/devcontainer/config/extends_test.go
• pkg/devcontainer/config/parse.go

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