chore: TypeScript <Label /> (#10494)

* chore: TypeScript <Label />

* rebase

* chore: TypeScript <Label />

* rebase

* A bunch o' test fixes. One more to go!

* helper for mountying Emotional components with Enzyme

* asf license

* fixed last test, some linting

* improve the storybook

* Adressing comments

Co-authored-by: Evan Rusackas <evan@preset.io>

superset-frontend/src/explore/components/controls/FixedOrMetricControl.jsx

@@ -18,8 +18,9 @@
  */
 import React from 'react';
 import PropTypes from 'prop-types';
-import { Label, Panel } from 'react-bootstrap';
+import { Panel } from 'react-bootstrap';
 
+import Label from 'src/components/Label';
 import TextControl from './TextControl';
 import MetricsControl from './MetricsControl';
 import ControlHeader from '../ControlHeader';
@@ -103,7 +104,7 @@ export default class FixedOrMetricControl extends React.Component {
     return (
       <div>
         <ControlHeader {...this.props} />
-        <Label style={{ cursor: 'pointer' }} onClick={this.toggle}>
+        <Label className="pointer" onClick={this.toggle}>
           {this.state.type === controlTypes.fixed && (
             <span>{this.state.fixedValue}</span>
           )}