Remove jetifier usage from android templates

[reidbaker]

In flutter/packages#9736 we found that jetifier required usage needs to be removed for apps to build. Flutter has not used the support libraries for a while and it should be safe to remove.

https://issuetracker.google.com/issues/184622491

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':alternate_language_test_plugin:compileDebugUnitTestJavaWithJavac'.
> Could not resolve all files for configuration ':alternate_language_test_plugin:debugUnitTestCompileClasspath'.
   > Failed to transform byte-buddy-1.17.5.jar (net.bytebuddy:byte-buddy:1.17.5) to match attributes {artifactType=android-classes-jar, org.gradle.category=library, org.gradle.libraryelements=jar, org.gradle.status=release, org.gradle.usage=java-api}.
      > Execution failed for JetifyTransform: /b/s/w/ir/cache/gradle/caches/modules-2/files-2.1/net.bytebuddy/byte-buddy/1.17.5/88450f120903b7e72470462cdbd2b75a3842223c/byte-buddy-1.17.5.jar.
         > Jetifier failed to transform: /b/s/w/ir/cache/gradle/caches/modules-2/files-2.1/net.bytebuddy/byte-buddy/1.17.5/88450f120903b7e72470462cdbd2b75a3842223c/byte-buddy-1.17.5.jar
           The error was: java.lang.IllegalArgumentException - Unsupported class file major version 68
           To fix this issue, see https://issuetracker.google.com/issues/184622491

[reidbaker]

Opting to not make a Migrator because if someone is still using the support libraries and needs justifier we wouldn't want to break those packages. Opting not to write a gradle_errors.dart handler because unsupported class X aka incompatibleJavaAndGradleVersionsHandler matches on the line right before what we would want to show AND the gradle error is helpful in that it tells you to remove jetifier usage and offers other work arounds.

[github-actions]

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