fix: duplicate .so resources on cold builds

[artus9033]

Summary

Fixes a first-run failure when publishing the brownfield AAR (publishToMavenLocal / brownfield publish:android) with Resource and asset merger: Duplicate resources errors for .so files in libsDebug / libsRelease.

Problem

With useStrippedSoFiles enabled (default), native libraries are staged into libs<Variant> (e.g. libsDebug) by copy<Variant>LibSources, and that folder is also registered as a JNI source directory for merge<Variant>JniLibFolders.

On a cold build, Gradle saw the same directory twice in the merge inputs:

• as a static jniLibs.srcDirs("libsDebug") entry
• again via mergeJniLibFolders.dependsOn(copyDebugLibSources), which writes to the same path

That produced duplicate-resource errors for every .so file. A second publish often succeeded because the copy task was UP-TO-DATE and the input wiring differed.

Fix

• RNSourceSets.kt: register JNI libs via project.files(libsDir).builtBy(copy<Variant>LibSources) instead of a static srcDirs(...), matching how Expo updates assets are wired,
• JNILibsProcessor.kt: remove the redundant dependsOn(copyTask) on mergeJniLibFolders; task ordering is now handled by builtBy.

This ensures libs<Variant> is included once in the JNI merge inputs while preserving the existing copy + copyStrippedSoLibs behavior.

Test plan

CI green.

[Copilot]

Pull request overview

Fixes a first-run AAR publish failure caused by merge<Variant>JniLibFolders seeing duplicate .so resources when useStrippedSoFiles stages native libs into libs<Variant> on cold builds.

Changes:

• Wire libs<Variant> into sourceSet.jniLibs via a FileCollection that is builtBy(copy<Variant>LibSources) instead of a static srcDirs(...) entry.
• Remove the redundant dependsOn(copy<Variant>LibSources) from merge<Variant>JniLibFolders configuration so the directory isn’t effectively introduced twice.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated no comments.

File	Description
gradle-plugins/react/brownfield/src/main/kotlin/com/callstack/react/brownfield/processors/JNILibsProcessor.kt	Removes explicit merge-task dependency on the copy task; ordering is now provided via builtBy wiring.
gradle-plugins/react/brownfield/src/main/kotlin/com/callstack/react/brownfield/plugin/RNSourceSets.kt	Registers libs<Variant> as a JNI libs source through a builtBy(copy<Variant>LibSources) file collection when useStrippedSoFiles is enabled.

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