cli/interactive_tests: deflake and accelerate test_multiple_nodes #40867
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Release justification: deflakes a test and makes CI run faster
Prior to this patch the test would attempt to shut down the cluster
gracefully after asserting that the 3 nodes are properly joined.
Unfortunately this wait is running into separate issue
#40834 and this makes
the test clean-up flaky.
Since this unit test is not about quitting a cluster but merely
checking that the join is successful, this patch both works around the
related issue and accelerates the test by simply killing the nodes.
Release note: None