Test jvm constraints plugin now configures jmh plugin

[bric3]

What Does This Do

Teach jmh plugin about the testJvm if present, without having to manually wire things in the build-file.

Motivation

This should be a convention. And avoids repetition. E.g. what's done in #11703

Additional Notes

Due to the way classloader works between buildsrc/ and regular projects, the plugin code has to use reflection.

Contributor Checklist

• Format the title according to the contribution guidelines
• Assign the type: and (comp: or inst:) labels in addition to any other useful labels
• Avoid using close, fix, or any linking keywords when referencing an issue
  Use solves instead, and assign the PR milestone to the issue
• Update the CODEOWNERS file on source file addition, migration, or deletion
• Update public documentation with any new configuration flags or behaviors
• Once approved, use merge queue to merge the PR

Jira ticket: [PROJ-IDENT]

[bric3]

@codex review

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Can't wait for the next one!

Reviewed commit: 9f4b41d4dc

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[dd-octo-sts]

🟢 Java Benchmark SLOs — All performance SLOs passed

Suite	Status
Startup	🟢 pass

SLO thresholds are defined here based on automatically generated metrics. A warning is raised when results are within 5% of the threshold.

PR vs. master results

Scenario	Candidate	master	Δ (95% CI of mean)
startup:insecure-bank:iast:Agent	13.95 s	13.86 s	[+0.1%; +1.2%] (maybe worse)
startup:insecure-bank:tracing:Agent	12.97 s	12.94 s	[-0.8%; +1.1%] (no difference)
startup:petclinic:appsec:Agent	16.95 s	16.72 s	[+0.3%; +2.4%] (maybe worse)
startup:petclinic:iast:Agent	16.92 s	16.98 s	[-1.2%; +0.5%] (no difference)
startup:petclinic:profiling:Agent	16.21 s	16.86 s	[-8.2%; +0.5%] (no difference)
startup:petclinic:sca:Agent	16.97 s	16.73 s	[+0.5%; +2.3%] (maybe worse)
startup:petclinic:tracing:Agent	16.12 s	16.08 s	[-0.5%; +1.0%] (no difference)

Commit: 9f4b41d4 · CI Pipeline · Benchmarking Platform UI

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Load and DaCapo benchmarks can be triggered manually in the GitLab pipeline. Results will appear in the Benchmarking Platform UI after completion.

[datadog-datadog-prod-us1-2]

More details

The JMH configuration is now applied centrally without changing the existing testJvm semantics: Gradle's withPlugin callback handles either plugin application order, and an unset testJvm leaves the JMH JVM unset. Focused execution was blocked because this checkout requires a Java 25 Gradle daemon while the sandbox has only JDK 8, 11, 17, and 21.

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