test: Verify Java 8 API check in logback

[adinauer]

📜 Description

Intentionally introduce the Java 9-only Objects.requireNonNullElse(Object, Object) API in the sentry-logback module.

This PR is a validation PR for #5745 and is expected to fail the new Java 8 API compatibility workflow.

💡 Motivation and Context

This verifies that the Codehaus Java 8 Animal Sniffer signature check catches Java 8 runtime incompatibilities outside the core :sentry module too.

💚 How did you test it?

Expected failure:

./gradlew java8ApiCompatibility --init-script .github/gradle/java8-api-compatibility.init.gradle.kts --no-configuration-cache -Dorg.gradle.configureondemand=false

[Undefined reference] io.sentry.logback.(SentryAppender.java:233)
  >> Object java.util.Objects.requireNonNullElse(Object, Object)

Formatting/API generation still passes:

./gradlew spotlessApply apiDump
BUILD SUCCESSFUL

📝 Checklist

• I added GH Issue ID & Linear ID
• I added tests to verify the changes.
• No new PII added or SDK only sends newly added PII if sendDefaultPII is enabled.
• I updated the docs if needed.
• I updated the wizard if needed.
• Review from the native team if needed.
• No breaking change or entry added to the changelog.
• No breaking change for hybrid SDKs or communicated to hybrid SDKs.
• Public API changes reviewed by another Mobile SDK team member or implemented according to the develop docs spec.

🔮 Next steps

Close this PR after confirming the workflow fails as expected.

#skip-changelog

[sentry]

📲 Install Builds

Android

🔗 App Name	App ID	Version	Configuration
SDK Size	io.sentry.tests.size	8.48.0 (1)	release

⚙️ sentry-android Build Distribution Settings

[github-actions]

Performance metrics 🚀

	Plain	With Sentry	Diff
Startup time	315.59 ms	372.33 ms	56.74 ms
Size	0 B	0 B	0 B

Baseline results on branch: ci/java8-api-compatibility

Startup times

Revision	Plain	With Sentry	Diff
29117d4	315.09 ms	353.43 ms	38.34 ms

App size

Revision	Plain	With Sentry	Diff
29117d4	0 B	0 B	0 B