roachtest: during c2c/shutdown, shutdown main driver if shutdown executor fails #110267
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During #110166, the c2c/shutdown test fataled while the job shutdown executor was running, yet the test kept running for quite a while because the goroutine that manages the c2c job had not realized the test failed. This patch refactors the c2c/shutdown tests such that when the job shutdown executor detects a failure, it cancels the context used by the goroutine managing the c2c job.
Informs #110166
Release note: none