Remove deprecated DayPicker and MonthPicker (#98543)

packages/flutter/lib/material.dart

@@ -56,7 +56,6 @@ export 'src/material/data_table_source.dart';
 export 'src/material/data_table_theme.dart';
 export 'src/material/date.dart';
 export 'src/material/date_picker.dart';
-export 'src/material/date_picker_deprecated.dart';
 export 'src/material/debug.dart';
 export 'src/material/desktop_text_selection.dart';
 export 'src/material/dialog.dart';

packages/flutter/lib/src/material/material_localizations.dart

@@ -96,10 +96,10 @@ abstract class MaterialLocalizations {
   /// The tooltip for the more button on an overflowing text selection menu.
   String get moreButtonTooltip;
 
-  /// The tooltip for the [MonthPicker]'s "next month" button.
+  /// The tooltip for the [CalendarDatePicker]'s "next month" button.
   String get nextMonthTooltip;
 
-  /// The tooltip for the [MonthPicker]'s "previous month" button.
+  /// The tooltip for the [CalendarDatePicker]'s "previous month" button.
   String get previousMonthTooltip;
 
   /// The tooltip for the [PaginatedDataTable]'s "first page" button.