chore: gradle plugin housekeeping

[artus9033]

Summary

This PR removes an obsolete ArtifactMatcher and fixes a typo in log message in the Gradle plugin.
The matcher is obsolete since it uses a hardcoded project group name of ExpoApp, which may be changed in app.json; it seems to have always been obsolete since the actual logic that performs the duty agnostically of the project name is present in ExpoPublishingHelper::shouldExcludeDependency, which excludes root project dependencies.

Test plan

[Copilot]

Pull request overview

This PR performs minor housekeeping in the brownfield Gradle plugin by removing an obsolete Expo artifact blacklist entry and fixing a log message typo to improve readability.

Changes:

• Removed the hardcoded ExpoApp ArtifactMatcher entry from the Expo transitive dependency artifact blacklist.
• Fixed a missing whitespace in the “Injecting dependency…” log line when modifying Gradle module metadata.

Reviewed changes

Copilot reviewed 1 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/shared/Constants.kt	Removes the obsolete hardcoded ExpoApp artifact blacklist entry.
gradle-plugins/react/brownfield/src/main/kotlin/com/callstack/react/brownfield/expo/ExpoPublishingHelper.kt	Fixes a log message formatting typo by adding the missing space.

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