Fix connection errors not being reflected for jobs

[farrelmahaztra]

Note

Ensures connection failures are captured and cleaned up correctly in eval contexts.

• Call _eval_enter() before connecting the environment so traces are registered even if connection fails
• On setup exceptions, delegate to __aexit__ for unified cleanup/reporting (context vars reset, backend notified), ensuring errors reflect in jobs/telemetry
• Link printing occurs after successful setup

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