feat(cmd): add --update-remote-user-uid-default flag to up command

[skevetter]

Summary

• Adds --update-remote-user-uid-default flag to the up command accepting on or off
• When devcontainer.json does not set updateRemoteUserUID, the CLI flag value is used as the default (previously always defaulted to true)
• When devcontainer.json explicitly sets updateRemoteUserUID, that value takes precedence over the CLI flag
• Includes unit tests for flag parsing, validation, and the shouldUpdateUserUID logic precedence
• Includes E2E test skeleton for the flag
• Fixes pre-existing build error in cmd/runusercommands.go (missing warnings parameter)

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⚙️ Run configuration

Configuration used: Organization UI

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Run ID: db5b8538-c121-41e4-8557-3088f4563bb9

📥 Commits

Reviewing files that changed from the base of the PR and between d2ca833 and ab8d90e.

📒 Files selected for processing (7)

• cmd/runusercommands.go
• cmd/up.go
• cmd/up_update_remote_user_uid_test.go
• e2e/tests/up/update_remote_user_uid.go
• pkg/driver/docker/docker.go
• pkg/driver/docker/docker_test.go
• pkg/provider/workspace.go

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