fix(test): integration test for validator node is broken

[mrnaveira]

Description

• Returned a specific log line back to the standard output, to be able to detect that the validator node finished starting up from the integration tests
• Fixed the compilation of the validator node application on integration test startup
• Tagged the existing integration tests for contract acceptances as @critical so any broken changes on future pull requests will be spotted

Motivation and Context

We want to be able to run tests on validator node operations like contract acceptance. It was broken at some point.

How Has This Been Tested?

The existing integration test for contract acceptance, done through the validator node, now runs successfully

[sdbondi]

Nice!

[brianp]

👌🏻