chore!: drop support of deprecated Selendroid driver (#1553)

BREAKING CHANGE: remove `SELENDROID` item from `AutomationName` interface and corresponding entry in `ElementMap` enum

Author: valfirst

src/main/java/io/appium/java_client/internal/ElementMap.java

@@ -34,7 +34,6 @@
 
 public enum ElementMap {
     ANDROID_UIAUTOMATOR2(AutomationName.ANDROID_UIAUTOMATOR2.toLowerCase(), AndroidElement.class),
-    SELENDROID(AutomationName.SELENDROID.toLowerCase(), AndroidElement.class),
     IOS_XCUI_TEST(AutomationName.IOS_XCUI_TEST.toLowerCase(), IOSElement.class),
     ANDROID_UI_AUTOMATOR(MobilePlatform.ANDROID.toLowerCase(), AndroidElement.class),
     IOS_UI_AUTOMATION(MobilePlatform.IOS.toLowerCase(), IOSElement.class),

src/main/java/io/appium/java_client/remote/AutomationName.java

@@ -20,8 +20,6 @@ public interface AutomationName {
     // Officially supported drivers
     @Deprecated
     String APPIUM = "Appium";
-    @Deprecated
-    String SELENDROID = "Selendroid";
     // https://github.com/appium/appium-xcuitest-driver
     String IOS_XCUI_TEST = "XCuiTest";
     // https://github.com/appium/appium-uiautomator2-driver