Fix Error Prone errors

Soong wasn't including android_app or android_test sources in the
javac-check target used for the Error Prone build, which allowed
some Error Prone errors to get in.  Fix them so Error Prone can be
re-enabled for these targets.

Fixes:
frameworks/base/core/tests/coretests/src/android/view/textclassifier/ActionsSuggestionsHelperTest.java:241: error: [JUnit4TestNotRun] This looks like a test method but is not run; please add @test and @Ignore, or, if this is a helper method, reduce its visibility.
frameworks/base/core/tests/systemproperties/src/android/os/SystemPropertiesTest.java:97: error: [JUnit3TestNotRun] Test method will not be run; please correct method signature (Should be public, non-static, and method name should begin with "test").
frameworks/base/services/tests/servicestests/src/com/android/server/backup/utils/FileUtilsTest.java:64: error: [CheckReturnValue] Ignored return value of method that is annotated with @CheckReturnValue
frameworks/base/services/tests/servicestests/src/com/android/server/backup/utils/FileUtilsTest.java:68: error: [CheckReturnValue] Ignored return value of method that is annotated with @CheckReturnValue
frameworks/base/services/tests/servicestests/src/com/android/server/backup/utils/FileUtilsTest.java:78: error: [CheckReturnValue] Ignored return value of method that is annotated with @CheckReturnValue
frameworks/base/services/tests/servicestests/src/com/android/server/hdmi/HdmiCecLocalDeviceAudioSystemTest.java:533: error: [JUnit4TestNotRun] This looks like a test method but is not run; please add @test and @Ignore, or, if this is a helper method, reduce its visibility.
frameworks/base/services/tests/servicestests/src/com/android/server/locksettings/LockSettingsStorageTests.java:480: error: [JUnit4TestNotRun] This looks like a test method but is not run; please add @test and @Ignore, or, if this is a helper method, reduce its visibility.
frameworks/base/services/tests/servicestests/src/com/android/server/locksettings/LockSettingsStorageTests.java:491: error: [JUnit4TestNotRun] This looks like a test method but is not run; please add @test and @Ignore, or, if this is a helper method, reduce its visibility.
frameworks/base/services/tests/uiservicestests/src/com/android/server/notification/NotificationManagerServiceTest.java:4196: error: [JUnit4TestNotRun] This looks like a test method but is not run; please add @test and @Ignore, or, if this is a helper method, reduce its visibility.

Bug: 146455923
Test: m RUN_ERROR_PRONE=true javac-check
Change-Id: I829373d41c97962fe2122ea74cef12ba342ac33c
Merged-In: I829373d41c97962fe2122ea74cef12ba342ac33c