feat: add adjust sample apps and CI example builds

[denischilik]

Summary

• Add Kotlin and Java sample apps for adjust-5 under kits/adjust/adjust-5/example/, matching the iOS kit example pattern.
• Introduce settings-kit-examples.gradle so example modules are built only via CI and stay out of settings-kits.gradle and kit settings.gradle.kts.
• Add kits/matrix.json and build-kits.yml to run kit unit tests and assemble both sample apps in PR CI.

Test plan

• ./gradlew -c settings-kit-examples.gradle -Pmparticle.kit.mparticleFromMavenLocalOnly=true ":kits:android-adjust:adjust-5:example-kotlin:assembleDebug"
• ./gradlew -c settings-kit-examples.gradle -Pmparticle.kit.mparticleFromMavenLocalOnly=true ":kits:android-adjust:adjust-5:example-java:assembleDebug"
• Verify build-kits workflow passes on PR
• Confirm settings-kits.gradle builds remain unchanged

[cursor]

PR Summary

Low Risk
Changes are limited to sample apps and CI wiring; no production kit or core SDK behavior is modified in this diff.

Overview
Adds matrix-driven kit CI via build-kits.yml and wires it into the PR workflow (including Dependabot automerge gating). The workflow loads kits/matrix.json, publishes the core SDK to Maven Local, runs per-kit testRelease, and optionally assembles Kotlin/Java example apps through settings-kit-examples.gradle.

Introduces an Adjust 5 Kotlin sample app under kits/adjust/adjust-5/example/example-kotlin (minimal MParticle bootstrap in ExampleApplication, standard launcher UI). Example modules stay out of settings-kits.gradle; only settings-kit-examples.gradle includes them for CI builds.

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[cursor]

Cursor Bugbot has reviewed your changes using default effort and found 1 potential issue.

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[nickolas-dimitrakas]

LGTM

[sonarqubecloud]

Quality Gate failed

Failed conditions
C Security Rating on New Code (required ≥ A)

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