selftests/bpf: Add bench_force_done() for early benchmark completion

The bench framework waits for duration_sec to elapse before collecting
results.  Benchmarks that know exactly how many samples they need can
call bench_force_done() to signal completion early, avoiding wasted
wall-clock time.

Also refactor collect_measurements() to reuse bench_force_done()
instead of open-coding the same mutex/cond_signal sequence.

Signed-off-by: Puranjay Mohan <puranjay@kernel.org>
Link: https://lore.kernel.org/r/20260427232313.1582588-2-puranjay@kernel.org
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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