fix(测试跟踪): 用例评审添加图片链接时页面展示异常

--bug=1015866 --user=宋昌昌 [测试跟踪]github #16952对每个用例进行评审时，点击添加图片链接 ，页面展示异常 https://www.tapd.cn/55049933/s/1235203

frontend/src/business/components/track/plan/view/comonents/functional/FunctionalTestCaseEdit.vue

@@ -628,4 +628,12 @@ p {
 /deep/ .el-drawer__body {
   overflow: unset;
 }
+
+/deep/ .el-form-item__content {
+  z-index: 1;
+}
+
+.head-bar {
+  z-index: 1;
+}
 </style>

frontend/src/business/components/track/review/view/components/TestReviewTestCaseEdit.vue

@@ -611,4 +611,8 @@ export default {
 /deep/ .el-drawer__body {
   overflow: unset;
 }
+
+/deep/ .el-form-item__content {
+  z-index: 1;
+}
 </style>