Fix androidTest junit classpath

[v-scharf]

https://ci.opencloud.rocks/repos/30/pipeline/41/3
compileOriginalDebugAndroidTestKotlin failed with "Cannot access 'org.junit.rules.TestRule' which is a supertype of GrantPermissionRule" because junit4 was not on the androidTest compile classpath, and AGP consistent resolution pinned the androidTest classpath to "strictly 4.7"

[Copilot]

Pull request overview

This PR fixes an instrumented-test compilation failure caused by an unintended junit:junit:4.7 version being pulled into the dependency graph and (via AGP consistent resolution) constraining the androidTest classpath, leading to missing org.junit.rules.TestRule for AndroidX test rules.

Changes:

• Exclude the stray transitive junit:junit coming from android-dav to prevent it from influencing the production/runtime classpath resolution.
• Add an explicit androidTestImplementation dependency on JUnit 4 (4.13.2 via version catalog) to ensure the androidTest compile classpath has the required JUnit APIs.

Reviewed changes

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

File	Description
opencloudComLibrary/build.gradle	Excludes transitive junit:junit from the android-dav API dependency to avoid pinning androidTest resolution to JUnit 4.7.
opencloudApp/build.gradle	Adds androidTestImplementation libs.junit4 so instrumented tests compile against the expected JUnit 4 APIs.

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