[test-utils] add log_prefix_for_test + store name of test in LogContext #878
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While trying to diagnose oxidecomputer/omicron#4779,
which only occurs in CI, I'm trying to collect ClickHouse logs. To do that we
need a way to uniquely identify the ClickHouse logs per test.
It is possible to derive the log prefix from
log_file_for_test
, but it seemscleaner to do it this way.
Not entirely sure about this design though -- a
LogContext
represents a single log file, but in this case we're also using it to generate a second path, kinda.