Revert GridTester changes, and fix java doc for the newly added getHa…

…shableKey() method, fix imports.

vaadin-testbench-unit-shared/src/main/java/com/vaadin/flow/component/grid/GridTester.java

@@ -560,7 +560,8 @@ private String getValueProviderString(int row, Grid.Column targetColumn)
  ColumnPathRenderer renderer = (ColumnPathRenderer) targetColumn
  .getRenderer();
 
- Field f = ColumnPathRenderer.class.getDeclaredField("provider");
+ Field f = ColumnPathRenderer.class
+ .getDeclaredField("provider");
  f.setAccessible(true);
 
  final ValueProvider columnValueProvider = (ValueProvider) f

vaadin-testbench-unit-shared/src/main/kotlin/com/vaadin/testbench/unit/internal/Shortcuts.kt

@@ -5,7 +5,6 @@ import com.vaadin.flow.component.Key
 import com.vaadin.flow.component.ShortcutRegistration
 import elemental.json.impl.JreJsonFactory
 import elemental.json.impl.JreJsonObject
-import java.lang.reflect.InvocationTargetException
 
 /**
  * Take a look at `DomEventListenerWrapper.matchesFilter()` to see why this is necessary.
@@ -27,25 +26,11 @@ private class MockFilterJsonObject(val key: Key, val modifiers: Set<Key>) : JreJ
  }
 
  /**
- * This method is used to get the HashableKey object from the
- * ShortcutRegistration class. This is needed because the HashableKey class
- * is private, and we need to create an instance of it to test the
- * generateEventModifierFilter method.
+ * Returns a HashableKey instance for the given key modifier.
+ * @param keyModifier the key modifier
+ * @return the HashableKey instance
  *
- * @param keyModifier
- * @return
- * @throws ClassNotFoundException
- * @throws InvocationTargetException
- * @throws InstantiationException
- * @throws IllegalAccessException
- */
- @Throws(
- ClassNotFoundException::class,
- InvocationTargetException::class,
- InstantiationException::class,
- IllegalAccessException::class
- )
-
+ */
  private fun getHashableKey(keyModifier: Key): Any? {
  return chashableKey.newInstance(keyModifier)
  }