feat(obs): add injection pipeline timing logs

[skevetter]

Summary

Adds structured timing logs at key injection milestones to provide visibility into how long injection takes. After the pipe() correctness fixes, machineprovider's 5s inactivity timeout became a concern — these logs make it easy to spot slow injection at a glance.

• Info-level start/complete bookends in Inject() and runSSHTunnel() (always visible)
• Debug-level intermediate milestones: handshake complete, payload delivered, SSH client/session created (visible with -v)
• All durations use time.Since(start) for human-readable elapsed times (e.g. "1.234s")
• Tests verify timing log lines appear using log.InitTestObserved

[netlify]

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⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

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Run ID: 9d3555bb-ead9-482b-89b3-66ac76ff2121

📥 Commits

Reviewing files that changed from the base of the PR and between 51a9405 and 06a2fc4.

📒 Files selected for processing (4)

• pkg/devcontainer/sshtunnel/sshtunnel.go
• pkg/devcontainer/sshtunnel/sshtunnel_test.go
• pkg/inject/inject.go
• pkg/inject/inject_test.go

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