refactor: remove example library from brownfield gradle plugin

[hurali97]

Summary

This removes the example-android-library from brownfield-gradle-plugin testing scope. The reason is the added maintenance with quite little value and we have already testing in place with using local maven published brownfield-gradle-plugin on CI and locally with Expo and RN Apps.

Test plan

• CI Passes

[Copilot]

Pull request overview

This PR removes the example-android-library from the Brownfield Gradle plugin’s local test/build scope and updates tooling/CI to run the plugin directly from gradle-plugins/react/brownfield (including adding a dedicated Gradle wrapper and version catalog there).

Changes:

• Delete the example-android-library module and related “example-only” conditionals in the plugin code.
• Make gradle-plugins/react/brownfield self-contained for running Gradle tasks (Gradle wrapper + gradle/libs.versions.toml) and update Yarn scripts/docs accordingly.
• Update GitHub Actions workflows and publishing script paths to run Gradle from gradle-plugins/react/brownfield.

Reviewed changes

Copilot reviewed 12 out of 17 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
gradle-plugins/react/settings.gradle.kts	Removes the old composite/example Gradle setup for the react plugin workspace.
gradle-plugins/react/README.md	Updates local lint command documentation (now intended to run via brownfield/gradlew).
gradle-plugins/react/package.json	Updates the lint script to invoke the plugin build directly from brownfield.
gradle-plugins/react/example-android-library/src/main/kotlin/com/callstack/example/Library.kt	Removes the example library source.
gradle-plugins/react/example-android-library/build.gradle.kts	Removes the example library Gradle build file.
gradle-plugins/react/brownfield/src/main/kotlin/com/callstack/react/brownfield/utils/Utils.kt	Removes example-library detection helper.
gradle-plugins/react/brownfield/src/main/kotlin/com/callstack/react/brownfield/plugin/RNSourceSets.kt	Removes early-exit that skipped configuration for the example library.
gradle-plugins/react/brownfield/src/main/kotlin/com/callstack/react/brownfield/artifacts/ArtifactsResolver.kt	Removes example-library early-exit for Expo embedding logic.
gradle-plugins/react/brownfield/settings.gradle	Removes settings-level version catalog configuration (replaced by local catalog file).
gradle-plugins/react/brownfield/gradlew.bat	Adds Windows Gradle wrapper script for the standalone plugin project.
gradle-plugins/react/brownfield/gradlew	Adds POSIX Gradle wrapper script for the standalone plugin project.
gradle-plugins/react/brownfield/gradle/wrapper/gradle-wrapper.properties	Adds Gradle wrapper distribution configuration.
gradle-plugins/react/brownfield/gradle/wrapper/gradle-wrapper.jar	Adds the Gradle wrapper JAR.
gradle-plugins/react/brownfield/gradle/libs.versions.toml	Adds a local version catalog for the standalone plugin project.
gradle-plugins/publish-to-maven-local.sh	Runs publishing from gradle-plugins/react/brownfield and updates task paths.
.github/workflows/release-brownfield-gradle-plugin.yml	Updates working directory and publish task invocation for release staging.
.github/workflows/gradle-plugin-lint.yml	Updates working directory and task invocation for detekt/ktlint in CI.

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