AuTest timing improvements

[bneradt]

Parallel AuTest runs were repeating similarly named tests, while timing
collection reset shared port allocation by starting a process per test.
Several tests also waited on client defaults, retries, and log buffering
rather than behavior under verification.

Exact test selection

The runner now anchors worker filters to test paths. This avoids suffix
collisions, duplicate runs, and parallel execution of serial tests.

Batch timing collection

The runner now measures completions from persistent worker batches. This
preserves shared port allocation and removes per-test process startup.

Rate-limit expiration

The rate-limit test bounds the queued client wait and requires the ATS
expiration diagnostic, retaining queue-expiration coverage.

Server-abort timeouts

The server-abort test disables retries and shortens connection and
inactivity timeouts that are unrelated to the expected abort.

JAX fingerprint log flushing

The JAX fingerprint test flushes log buffers once per second so its
existing log assertions do not wait on production buffering defaults.

Stale-response log flushing

The stale-response test similarly flushes logs once per second while
retaining its existing traffic and log assertions.

Local timing results

In the asfats5 container with a Debug build, an instrumented full-suite
autest.sh -j8 -v invocation decreased from 18m43s (1122.8 seconds) to
15m09s (908.8 seconds). This saved 3m34s of wall-clock time, or 19%.

Test	Before	After
rate_limit_sni	308.2s	11.4s
server_abort	127.4s	6.1s
jax_fingerprint	169.3s	102.6s
stale_response	113.4s	81.3s

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