rtla/tests: Extend timerlat top --aa-only coverage

rtla-timerlat-top's --aa-only option is currently only tested for return
value.

Extend the tests to also check that only auto-analysis is being done via
a negative match for the "Timer Latency" text in the top header, and
further split the test case into two:

- one test case for --aa-only stopping on threshold
- one test case for --aa-only exiting without threshold being hit

For both cases, the expected output ("analyzing it" or "Max latency was"
respectively) is checked against in addition to the negative match.

Reviewed-by: Wander Lairson Costa <wander@redhat.com>
Link: https://lore.kernel.org/r/20260423130558.882022-6-tglozar@redhat.com
Signed-off-by: Tomas Glozar <tglozar@redhat.com>

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