feat(Summary): add title attribute to summary label and result #6505

Author: ddincheva

projects/igniteui-angular/src/lib/core/styles/components/grid-summary/_grid-summary-theme.scss

@@ -123,7 +123,6 @@
 
         &::after {
             position: absolute;
-            content: '';
             top: 0;
             bottom: 0;
             left: 0;

projects/igniteui-angular/src/lib/grids/summaries/summary-cell.component.html

@@ -10,8 +10,8 @@
                     </div>
                 </ng-container>
 
-                <span class="igx-grid-summary__label" title="{{ summary.label }}">{{ translateSummary(summary) }}</span>
-                <span class="igx-grid-summary__result" title="{{ summary.summaryResult }}">
+                <span class="igx-grid-summary__label" [attr.title]="summary.label">{{ translateSummary(summary) }}</span>
+                <span class="igx-grid-summary__result" [attr.title]="summary.summaryResult">
                     {{ columnDatatype === 'number' ? (summary.summaryResult | igxdecimal: grid.locale) : columnDatatype === 'date' ? (summary.summaryResult | igxdate: grid.locale) : (summary.summaryResult) }}
                 </span>
             </div>