fix: Fix button linter rules

Signed-off-by: Carlos Esteban Lopez <lcarlosesteb@vmware.com>

plugins/techdocs/src/reader/transformers/copyToClipboard.tsx

@@ -23,6 +23,8 @@ import {
   SvgIcon,
   Tooltip,
 } from '@material-ui/core';
+import Button from '@material-ui/core/Button';
+import type { Transformer } from './transformer';
 
 const CopyToClipboardTooltip = withStyles(theme => ({
   tooltip: {
@@ -65,15 +67,13 @@ const CopyToClipboardButton = ({ text }: CopyToClipboardButtonProps) => {
       onClose={handleClose}
       leaveDelay={1000}
     >
-      <button className="md-clipboard md-icon" onClick={handleClick}>
+      <Button className="md-clipboard md-icon" onClick={handleClick}>
         <CopyToClipboardIcon />
-      </button>
+      </Button>
     </CopyToClipboardTooltip>
   );
 };
 
-import type { Transformer } from './transformer';
-
 /**
  * Recreates copy-to-clipboard functionality attached to <code> snippets that
  * is native to mkdocs-material theme.

plugins/techdocs/src/search/components/TechDocsSearch.test.tsx

@@ -16,6 +16,7 @@
 import { ApiProvider } from '@backstage/core-app-api';
 import { searchApiRef } from '@backstage/plugin-search-react';
 import { TestApiRegistry, wrapInTestApp } from '@backstage/test-utils';
+import Button from '@material-ui/core/Button';
 import {
   act,
   fireEvent,
@@ -136,9 +137,9 @@ describe('<TechDocsSearch />', () => {
       const [entityName, setEntityName] = useState(entityId);
       return wrapInTestApp(
         <ApiProvider apis={apiRegistry}>
-          <button onClick={() => setEntityName(newEntityId)}>
+          <Button onClick={() => setEntityName(newEntityId)}>
             Update Entity
-          </button>
+          </Button>
           <TechDocsSearch entityId={entityName} debounceTime={0} />
         </ApiProvider>,
       );