chore(react-headless-components-preview): add Popover to bundle-size fixture (#36084)

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: mainframev <14054752+mainframev@users.noreply.github.com>

Author: Copilot

packages/react-components/react-headless-components-preview/library/bundle-size/AllComponents.fixture.js

@@ -12,6 +12,7 @@ import * as Input from '@fluentui/react-headless-components-preview/input';
 import * as Link from '@fluentui/react-headless-components-preview/link';
 import * as MessageBar from '@fluentui/react-headless-components-preview/message-bar';
 import * as ProgressBar from '@fluentui/react-headless-components-preview/progress-bar';
+import * as Popover from '@fluentui/react-headless-components-preview/popover';
 import * as Provider from '@fluentui/react-headless-components-preview/provider';
 import * as RadioGroup from '@fluentui/react-headless-components-preview/radio-group';
 import * as RatingDisplay from '@fluentui/react-headless-components-preview/rating-display';
@@ -43,6 +44,7 @@ console.log({
   Link,
   MessageBar,
   ProgressBar,
+  Popover,
   Provider,
   RadioGroup,
   RatingDisplay,