[RNGP] chore: ☂️ migrate BackwardCompatUtilsTest to AssertJ

[gustavoabel]

Summary:

Issue: #45596

Changelog:

Migrated to AssertJ within file:

• BackwardCompatUtilsTest.kt

[Android] [Changed] - Migrated BackwardCompatUtilsTest

Test Plan:

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

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[gustavoabel]

hey @cortinico, it's done.

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

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@cortinico merged this pull request in 7829de6.

[react-native-bot]

This pull request was successfully merged by @gustavoabel in 7829de6

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