Add throughput cap error message (#1151)

src/Explorer/Panes/StringInputPane/__snapshots__/StringInputPane.test.tsx.snap

@@ -675,18 +675,21 @@ exports[`StringInput Pane should render Create new directory properly 1`] = `
       </div>
       <PanelFooterComponent
         buttonLabel="Create"
+        isButtonDisabled={false}
       >
         <div
           className="panelFooter"
         >
           <CustomizedPrimaryButton
             ariaLabel="Create"
+            disabled={false}
             id="sidePanelOkButton"
             text="Create"
             type="submit"
           >
             <PrimaryButton
               ariaLabel="Create"
+              disabled={false}
               id="sidePanelOkButton"
               text="Create"
               theme={
@@ -966,6 +969,7 @@ exports[`StringInput Pane should render Create new directory properly 1`] = `
             >
               <CustomizedDefaultButton
                 ariaLabel="Create"
+                disabled={false}
                 id="sidePanelOkButton"
                 onRenderDescription={[Function]}
                 primary={true}
@@ -1247,6 +1251,7 @@ exports[`StringInput Pane should render Create new directory properly 1`] = `
               >
                 <DefaultButton
                   ariaLabel="Create"
+                  disabled={false}
                   id="sidePanelOkButton"
                   onRenderDescription={[Function]}
                   primary={true}
@@ -1529,6 +1534,7 @@ exports[`StringInput Pane should render Create new directory properly 1`] = `
                   <BaseButton
                     ariaLabel="Create"
                     baseClassName="ms-Button"
+                    disabled={false}
                     id="sidePanelOkButton"
                     onRenderDescription={[Function]}
                     primary={true}