Added css classes for cypress testing (#2344)

cvat-ui/src/components/tasks-page/styles.scss

@@ -3,6 +3,7 @@
 // SPDX-License-Identifier: MIT
 
 @import '../../base.scss';
+@import '../../styles.scss';
 
 .cvat-tasks-page {
     padding-top: 15px;
@@ -159,6 +160,10 @@
     margin-right: 20px;
 }
 
+.cvat-item-task-name {
+    @extend .cvat-text-color;
+}
+
 #cvat-create-task-button {
     padding: 0 30px;
 }

cvat-ui/src/components/tasks-page/task-item.tsx

@@ -52,8 +52,8 @@ class TaskItemComponent extends React.PureComponent<TaskItemProps & RouteCompone
 
         return (
             <Col span={10} className='cvat-task-item-description'>
-                <Text strong type='secondary'>{`#${id}: `}</Text>
+                <Text strong type='secondary' className='cvat-item-task-id'>{`#${id}: `}</Text>
-                <Text strong className='cvat-text-color'>{name}</Text>
+                <Text strong className='cvat-item-task-name'>{name}</Text>
                 <br />
                 { owner
                     && (