chore: Migrate FileUtilsTest.kt, NdkConfiguratorUtilsTest.kt and AgpConfiguratorUtilsTest.kt to AssertJ

[henriquecicero]

Summary:

Issue: #45596

Changelog:

[INTERNAL] [CHANGED] - Migrated to AssertJ within files FileUtilsTest.kt, NdkConfiguratorUtilsTest.kt and AgpConfiguratorUtilsTest.kt

Test Plan:

Run ./gradlew -p packages/gradle-plugin test

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[henriquecicero]

Hi, @cortinico, it's done.

[cortinico]

@henriquecicero can you please sign our CLA otherwise we won't be able to accept your contribution

[henriquecicero]

@cortinico, I did it just now.

[cortinico]

Left a couple of suggestions to make it more idiomatic

[henriquecicero]

@cortinico, thanks for the suggestions.

[facebook-github-bot]

@cortinico has imported this pull request. If you are a Meta employee, you can view this diff on Phabricator.

[facebook-github-bot]

@cortinico merged this pull request in f443511.

[react-native-bot]

This pull request was successfully merged by @henriquecicero in f443511

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