tests/depot: Assert that bugs were fixed

• tests/depot: Assert that pressure-vessel-wrap preserves exit status

  This was fixed in steam/pressure-vessel!18.

• tests/depot: Run steam-runtime-system-info --version

  This was fixed in steam/steam-runtime-tools!95.

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Do not merge until the referenced MRs have been released to scout and built successfully.

Testing in: https://jenkins.internal.steamos.cloud/job/playground/job/scout/job/build/140