Migrate SLF4J Simple test setup to a convention plugin

[bric3]

What Does This Do

Replaces the SLF4J Simple test script with a convention plugin and migrates its consumers.

Motivation

Keeps the shared test logging setup typed and reusable while preserving its behavior.

Additional Notes

None.

[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	14.03 s	13.97 s	[-0.5%; +1.3%] (no difference)
startup:insecure-bank:tracing:Agent	12.95 s	13.00 s	[-1.2%; +0.4%] (no difference)
startup:petclinic:appsec:Agent	16.93 s	16.78 s	[-0.2%; +1.9%] (no difference)
startup:petclinic:iast:Agent	16.41 s	16.94 s	[-7.5%; +1.3%] (no difference)
startup:petclinic:profiling:Agent	16.74 s	16.70 s	[-0.7%; +1.1%] (no difference)
startup:petclinic:sca:Agent	16.73 s	16.65 s	[-0.5%; +1.5%] (no difference)
startup:petclinic:tracing:Agent	16.08 s	15.98 s	[-0.1%; +1.3%] (no difference)

Commit: d847ad85 · 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-prod-us1-5]

More details

The convention plugin keeps the prior configuration matching, dependency replacement, and test JVM arguments. All four users move to the new plugin.

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