testing: bench: add pytest_report_header (#10132)

* testing: bench: add pytest_report_header

Useful for sanity checks in logs.

* Update dvc/testing/benchmarks/plugin.py

* [pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

---------

Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>

dvc/testing/benchmarks/plugin.py

@@ -4,6 +4,11 @@
 DEFAULT_PROJECT_GIT_REPO = "https://github.com/iterative/example-get-started"
 
 
+def pytest_report_header(config):
+    bconf = config.bench_config
+    return "dvc-bench: (" f"size: '{bconf.size}'," f"revs: '{bconf.dvc_revs}'" ")"
+
+
 def pytest_generate_tests(metafunc):
     str_revs = metafunc.config.getoption("--dvc-revs")
     revs = str_revs.split(",") if str_revs else [None]