fix(run): respect user-specified consistency in workspaceMount

[skevetter]

Summary

• Parse user's workspaceMount string for an existing consistency= value before applying the default consistency='consistent' on non-Linux
• Generalize nerdctl consistency stripping to handle all consistency values (delegated, cached, etc.), not just the hardcoded 'consistent'
• Add E2E test with consistency=delegated in workspaceMount to verify mount string is preserved

Spec alignment

The official devcontainers CLI respects user-specified consistency values in workspaceMount strings (ref: github.com/devcontainers/cli src/spec-node/containerFeatures.ts mount handling). This change aligns our behavior:

• User-specified consistency=delegated or consistency=cached is now preserved on Docker
• Default consistency='consistent' is still applied on non-Linux when no consistency is specified
• Linux behavior unchanged (no consistency option added)
• Nerdctl correctly strips all consistency values (not just 'consistent'), since nerdctl doesn't support this Docker Desktop-specific option
• Standard devcontainer.json compatibility is preserved — no intentional divergences

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⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 0e8c6737-eb9a-4860-9287-6f1f41b43831

📥 Commits

Reviewing files that changed from the base of the PR and between a148fb3 and 56daaa8.

📒 Files selected for processing (6)

• e2e/tests/up/provider_docker.go
• e2e/tests/up/testdata/docker-workspace-mount-consistency/.devcontainer.json
• pkg/devcontainer/run.go
• pkg/devcontainer/run_test.go
• pkg/driver/docker/docker.go
• pkg/driver/docker/docker_test.go

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