Tasks: Activity bump on log viewing

[mafredri]

Repo: coder/coder

Scope: Add workspace activity bump when users view task logs to prevent auto-pause during active monitoring.

Problem: Currently, viewing task logs via /logs endpoint does not bump workspace deadline. A user actively monitoring a task (checking logs every few minutes) will see the task auto-pause despite their engagement. This creates an inconsistent experience where UI interaction differs from CLI behavior.

Changes:

• Modify GET /api/v2/tasks/{user}/{task}/logs in coderd/aitasks.go
• Call ActivityBumpWorkspace when logs are fetched for an active task (not when paused - that's just viewing the snapshot)
• Use the same activity bump logic as other user interactions

Files:

• coderd/aitasks.go

Acceptance criteria:

• Viewing logs for active task bumps workspace deadline
• Viewing snapshot for paused task does NOT bump deadline
• Activity bump uses same logic as other workspace interactions
• No regression in log viewing performance

Dependencies: None

References:

• RFC: Tasks: Start/Pause/Resume Lifecycle: TTL Integration ("User interactions (viewing logs, sending messages) also bump the deadline via their respective endpoints")