Sampath accessibility sev 2 (#1400)

* autoscale and manual radiobuutton fixes

* alt text attribute for images

* Revert "alt text attribute for images"

This reverts commit 5a660551c6.

* alt text for decorative images

* sev2 accessibilitydefects in data explorer

* Revert "sev2 accessibilitydefects in data explorer"

This reverts commit b84d5b572c.

* Sev2 accessibilitydefects

* Revert "Sev2 accessibilitydefects"

This reverts commit a4e60f106c.

* accessibilitydefects-data explorer

* Remove extra white space

---------

Co-authored-by: Victor Meng <vimeng@microsoft.com>

src/Explorer/Menus/NotificationConsole/NotificationConsoleComponent.tsx

@@ -147,12 +147,9 @@ export class NotificationConsoleComponent extends React.Component<
             <div className="notificationConsoleControls">
               <Dropdown
                 label="Filter:"
-                role="combobox"
                 selectedKey={this.state.selectedFilter}
                 options={NotificationConsoleComponent.FilterOptions}
                 onChange={this.onFilterSelected.bind(this)}
-                aria-labelledby="consoleFilterLabel"
-                aria-label={this.state.selectedFilter}
               />
               <span className="consoleSplitter" />
               <span