fix: propagate git SSH signing key in daemon path and context in backhaul

[skevetter]

Summary

Fast follow from #719. Fixes two pre-existing issues surfaced during review:

• GitSSHSigningKey not propagated in daemon path: Daemon-based browser IDE sessions (e.g. DevPod Pro) silently dropped the SSH signing key, so git commit signing didn't work. The SSH tunnel path already handled this correctly. Adds GitSSHSigningKey to StartServicesDaemonOptions and propagates it from makeDaemonStartFunc.

• SetupBackhaul not context-aware: The backhaul SSH process (devpod ssh --command "while true; do sleep 6000000; done") used exec.Command instead of exec.CommandContext, so it was orphaned when the browser session ended. Now uses the caller's context for proper cleanup.

Also restores a portability comment explaining why while true; do sleep 6000000; done is used instead of sleep infinity (not available on all systems), and adds a deferred writer.Close() in SetupBackhaul.

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

Run ID: be38e9da-f88c-4034-8692-3bb181b7f3db

📥 Commits

Reviewing files that changed from the base of the PR and between b5d20ba and 105a084.

📒 Files selected for processing (3)

• pkg/client/clientimplementation/services.go
• pkg/ide/opener/opener.go
• pkg/tunnel/browser.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/backhaul-context-and-daemon-signing-key

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[skevetter]

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