Handle StringCaseLocaleUsage as error (#6175)

See #6163 (comment)

Signed-off-by: Johnny Lim <[email protected]>

Author: izeye

build.gradle

@@ -71,6 +71,7 @@ subprojects {
         tasks.withType(JavaCompile).configureEach {
             options.errorprone.disableWarningsInGeneratedCode = true
             options.errorprone.excludedPaths = ".*/build/generated/.*"
+            options.errorprone.error("StringCaseLocaleUsage")
 
             if (!javaLanguageVersion.canCompileOrRun(17)) {
                 // Error Prone does not work with JDK <17