Fix sandbox not found test

[ValentaTomas]

• Fix error code in json
• Modify the error message to match the new returned error

[changeset-bot]

⚠️ No Changeset found

Latest commit: 6205bf3

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[ValentaTomas]

This PR requires e2b-dev/infra#578 to be deployed to pass, but it fixes a bug with 0 status code.