Remove maps v3beta

[regeter]

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Fixes #<issue_number_goes_here> 🦕

[snippet-bot]

Here is the summary of changes.

You are about to delete 6 region tags.

• ApiDemos/java/app/src/gms/java/com/example/mapdemo/CameraDemoActivity.java:45, tag maps_camera_events
• ApiDemos/java/app/src/gms/java/com/example/mapdemo/MyLocationDemoActivity.java:89, tag maps_check_location_permission
• ApiDemos/java/app/src/gms/java/com/example/mapdemo/MyLocationDemoActivity.java:117, tag maps_check_location_permission_result
• ApiDemos/java/app/src/v3/java/com/example/mapdemo/CameraDemoActivity.java:44, tag maps_camera_events
• ApiDemos/java/app/src/v3/java/com/example/mapdemo/MyLocationDemoActivity.java:84, tag maps_check_location_permission
• ApiDemos/java/app/src/v3/java/com/example/mapdemo/MyLocationDemoActivity.java:111, tag maps_check_location_permission_result

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[wangela]

Thank you for this pull request!

1. All the files under /src/gms/java/com/example/mapdemo and /src/gms/res should be moved to /src/main, not deleted.
2. Recommend leaving ApiDemos/java/gradle/wrapper/gradle-wrapper.properties unchanged as Gradle dependencies should be updated in a separate PR to keep the scope of this PR tidy.
3. Since new commits have been merged since this PR, please sync your fork and resolve any merge conflicts

[wangela]

This should not be gitignored

[wangela]

We should keep the tests lines