[FEA] In CI for cuOpt service, skip the rest of tests if the server goes down

[tmckayus]

Try to find a way to skip the rest of the server tests if the server goes down unexpectedly. Running all the tests when there is no server present creates a huge log which makes it hard to diagnose the particular issue.

We had a case where a nightly build of cudf broke the server healthcheck and the server failed on the first check after boot. But, all the tests continued to run creating a hug log of failed connections.

[github-actions]

🔔 Hi @anandhkb @hlinsen, this issue has had no activity for 21 days. Please update or let us know if it can be closed. Thank you!

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