[Table] Retain rows in scope (#1813)

* [Table] Push rows in as they are added

...such that sorting does not cause real-time table rows to be lost.
Fixes #1738

* [Table] Test adding rows

* [Table] Fix code style in test

https://github.com/nasa/openmct/pull/1813#pullrequestreview-78277635

platform/features/table/src/controllers/TelemetryTableController.js

@@ -170,6 +170,9 @@ define(
          * @param rows
          */
         TelemetryTableController.prototype.addRowsToTable = function (rows) {
+            rows.forEach(function (row) {
+                this.$scope.rows.push(row);
+            }, this);
             this.$scope.$broadcast('add:rows', rows);
         };