chore(linux tests) remove deprecated jdk17-only check

[dduportal]

Fix #304

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[timja]

This is removing the check rather than the if guard that skipped this part of the test on Java 17

[dduportal]

This is removing the check rather than the if guard that skipped this part of the test on Java 17

My bad, I misunderstood the initial intent. Should be fixed now.

[dduportal]

Ah ah nice one: the use build args correctly test, which uses another version of the remoting than the specified one, fails the associated check: it uses a remoting version pre-dating the fix jenkinsci/remoting#532 :D

Gotta update the "old remoting" version being checked in this PR.