test(perf): add exact 1MiB ABBA benchmark drivers (#5260)

* test(perf): add exact 1mib get abba harness

Add a backlog#1434 exact-1MiB GET attribution wrapper around the codec streaming smoke runner. The harness fixes the legacy versus codec-legacy ABBA profile order, the outer ReaderStream buffer axis, path-proof artifacts, and GET stage-metrics capture so reviewers can reproduce isolated-host attribution without drifting the experiment matrix.

Verification:

- scripts/test_get_1mib_abba_stage_metrics.sh

- bash -n scripts/run_get_1mib_abba_stage_metrics.sh scripts/test_get_1mib_abba_stage_metrics.sh

- git diff --check

Co-Authored-By: heihutu <heihutu@gmail.com>

* test(perf): add exact 1MiB handoff ABBA driver

Add a backlog#1434 benchmark orchestrator for isolated-host exact-1MiB handoff evidence. The runner records A/B/B/A and C/D/D/C legs, server provenance, expected reader path labels, inner and outer buffer capacity labels, and stage metrics capture arguments while delegating workload execution to the existing enhanced batch benchmark driver.

Verification:

- scripts/test_exact_1mib_handoff_abba.sh

- bash -n scripts/run_exact_1mib_handoff_abba.sh scripts/test_exact_1mib_handoff_abba.sh

- make script-tests

- git diff --check

Co-Authored-By: heihutu <heihutu@gmail.com>

---------

Co-authored-by: heihutu <heihutu@gmail.com>

.config/make/tests.mak

@@ -28,6 +28,7 @@ script-tests: ## Run shell script tests
 	./scripts/test_entrypoint_credentials.sh
 	./scripts/test_internode_grpc_ab_bench.sh
 	./scripts/test_object_batch_bench_enhanced.sh
+	./scripts/test_exact_1mib_handoff_abba.sh
 	./scripts/test_pinned_paired_abba_bench.sh
 	bash -n ./scripts/validate_object_data_cache_cold_stampede.sh
 	python3 ./scripts/check_object_data_cache_follower_samples.py --self-test