Use Gradle Wrapper 6.6 (-all variant) (#29793)

Summary:
`-all` is the **default** for projects generated by Android Studio, and it provides **additional sources** helpful for debugging. It's also much more likely to already exist on a developer's machine (which has built other Android projects), avoiding additional downloads and saving disk space.

`-all` has also been the variant used in `react-native` for all versions prior to 5bc67b6.

Follow-up to facebook/react-native#29613

## Changelog

[Android] [Changed] - Use Gradle Wrapper 6.6 (-all variant)

Pull Request resolved: facebook/react-native#29793

Test Plan: No test needed since versions are the same.

Reviewed By: fkgozali

Differential Revision: D23406546

Pulled By: mdvacca

fbshipit-source-id: b74dbbfc0317bccf1940b1e5062d866e50aed28a

android/gradle/wrapper/gradle-wrapper.properties

@@ -1,5 +1,5 @@
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.6-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.6-all.zip
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists