chore(frontend): comprehensive TypeScript quality improvements (#37625)

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

superset-frontend/src/explore/components/controls/DatasourceControl/DatasourceControl.test.tsx

@@ -41,7 +41,6 @@ beforeEach(() => {
 });
 
 afterEach(() => {
-  // @ts-ignore
   window.location = originalLocation;
   fetchMock.clearHistory().removeRoutes();
   jest.clearAllMocks(); // Clears mock history but keeps spy in place
@@ -524,9 +523,9 @@ test('should show missing params state', () => {
 });
 
 test('should show missing dataset state', () => {
-  // @ts-ignore
+  // @ts-expect-error - overriding window.location for test
   delete window.location;
-  // @ts-ignore
+  // @ts-expect-error - overriding window.location for test
   window.location = { search: '?slice_id=152' };
   const props = createProps({ datasource: fallbackExploreInitialData.dataset });
   render(<DatasourceControl {...props} />, { useRedux: true, useRouter: true });
@@ -539,9 +538,9 @@ test('should show missing dataset state', () => {
 });
 
 test('should show forbidden dataset state', () => {
-  // @ts-ignore
+  // @ts-expect-error - overriding window.location for test
   delete window.location;
-  // @ts-ignore
+  // @ts-expect-error - overriding window.location for test
   window.location = { search: '?slice_id=152' };
   const error = {
     error_type: 'TABLE_SECURITY_ACCESS_ERROR',

superset-frontend/src/explore/components/controls/DatasourceControl/index.tsx

@@ -19,7 +19,6 @@
  */
 
 import React, { PureComponent } from 'react';
-import PropTypes from 'prop-types';
 import { DatasourceType, SupersetClient, Datasource } from '@superset-ui/core';
 import { t } from '@apache-superset/core';
 import {
@@ -119,25 +118,6 @@ interface DatasourceControlState {
   showDatasource?: boolean;
 }
 
-const propTypes = {
-  actions: PropTypes.object.isRequired,
-  onChange: PropTypes.func,
-  value: PropTypes.string,
-  datasource: PropTypes.object.isRequired,
-  form_data: PropTypes.object.isRequired,
-  isEditable: PropTypes.bool,
-  onDatasourceSave: PropTypes.func,
-  user: PropTypes.object.isRequired,
-  // ControlHeader-related props
-  hovered: PropTypes.bool,
-  type: PropTypes.string,
-  label: PropTypes.string,
-  default: PropTypes.any,
-  description: PropTypes.string,
-  validationErrors: PropTypes.array,
-  name: PropTypes.string,
-};
-
 const defaultProps = {
   onChange: () => {},
   onDatasourceSave: null,
@@ -258,8 +238,6 @@ class DatasourceControl extends PureComponent<
   DatasourceControlProps,
   DatasourceControlState
 > {
-  static propTypes = propTypes;
-
   static defaultProps = defaultProps;
 
   constructor(props: DatasourceControlProps) {