bazel/bench: add tests to benchmarks

[rockwotj]

Just to smoke test they work. In both debug and release so hopefully we
catch stuff in the sanitizer when we get that working.

Backports Required

• none - not a bug fix
• none - this is a backport
• none - issue does not exist in previous branches
• none - papercut/not impactful enough to backport
• v24.3.x
• v24.2.x
• v24.1.x

Release Notes

• none

[StephanDollberg]

Makes sense.

[IoannisRP]

logic looks solid 👍

[rockwotj]

Looks like some of the benchmarks are broken in bazel - I'll start debugging those.

[rockwotj]

Force push: fixed propagating environment variables and data into benchmark tests also bumped timeouts for a couple of tests that are slow in fastbuild.

[rockwotj]

force push: fix linter

[vbotbuildovich]

CI test results

test results on build#60792

test_id	test_kind	job_url	test_status	passed
idempotency_tests_rpunit.idempotency_tests_rpunit	unit	https://buildkite.com/redpanda/redpanda/builds/60792#01946b01-d71d-4e9c-92ca-495db6e61d4d	FLAKY	1/2

[dotnwat]

great idea

[rockwotj]

Thanks! Borrowed it from envoyproxy - so keith probably 😛

[nvartolomei]

@rockwotj is it intended that running something like bazel test //src/v/datalake/tests:record_multiplexer_rpbench_test --test_output=streamed --cache_test_results=no doesn't show stdout/bench results but only the stderr?

[rockwotj]

I think my intention was to not care about the benchmark numbers for *_test. If you care about the benchmark numbers then just run the benchmark directly bazel run //src/v/datalake/tests:record_multiplexer_rpbench

[rockwotj]

Happy to take a PR to revert the --no-stdout bit tho