Remove maps v3beta

[regeter]

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Fixes #<issue_number_goes_here> 🦕

[snippet-bot[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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