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/Controls/TreeComponent/TreeComponent.tsx

@@ -195,7 +195,7 @@ export class TreeNodeComponent extends React.Component<TreeNodeComponentProps, T
         </div>
         {node.children && (
           <AnimateHeight duration={TreeNodeComponent.transitionDurationMS} height={this.state.isExpanded ? "auto" : 0}>
-            <div className="nodeChildren" data-test={node.label}>
+            <div className="nodeChildren" data-test={node.label} role="group">
               {TreeNodeComponent.getSortedChildren(node).map((childNode: TreeNode) => (
                 <TreeNodeComponent
                   key={`${childNode.label}-${generation + 1}-${childNode.timestamp}`}

src/Explorer/Controls/TreeComponent/__snapshots__/TreeComponent.test.tsx.snap

@@ -100,6 +100,7 @@ exports[`TreeNodeComponent does not render children by default 1`] = `
     <div
       className="nodeChildren"
       data-test="label"
+      role="group"
     >
       <TreeNodeComponent
         generation={3}
@@ -251,6 +252,7 @@ exports[`TreeNodeComponent renders a simple node (sorted children, expanded) 1`]
     <div
       className="nodeChildren"
       data-test="label"
+      role="group"
     >
       <TreeNodeComponent
         generation={13}
@@ -352,6 +354,7 @@ exports[`TreeNodeComponent renders loading icon 1`] = `
     <div
       className="nodeChildren"
       data-test="label"
+      role="group"
     />
   </AnimateHeight>
 </div>
@@ -465,6 +468,7 @@ exports[`TreeNodeComponent renders sorted children, expanded, leaves and parents
     <div
       className="nodeChildren"
       data-test="label"
+      role="group"
     >
       <TreeNodeComponent
         generation={13}
@@ -594,6 +598,7 @@ exports[`TreeNodeComponent renders unsorted children by default 1`] = `
     <div
       className="nodeChildren"
       data-test="label"
+      role="group"
     >
       <TreeNodeComponent
         generation={3}