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

[Copilot]

Adds the Popover entry to the AllComponents.fixture.js bundle-size fixture so it is tracked alongside the other headless components.

Changes

• AllComponents.fixture.js: Added import and console.log entry for Popover (alphabetically between ProgressBar and Provider)

import * as Popover from '@fluentui/react-headless-components-preview/popover';

Original prompt

Update packages/react-components/react-headless-components-preview/library/bundle-size/AllComponents.fixture.js to include the Popover component in the bundle-size fixture.

Changes required:

1. Add a new import (alphabetically placed between ProgressBar and Provider):

   import * as Popover from '@fluentui/react-headless-components-preview/popover';

2. Add Popover to the console.log({...}) object (in the same alphabetical position, between ProgressBar and Provider).

Do not modify any other files. Keep formatting consistent with the existing file.

The following is the prior conversation context from the user's chat exploration (may be truncated):

User: ```
import * as Popover from '@fluentui/react-headless-components-preview/popover';

create a new PR with headless Popover bundle-size fixture (AllComponents.fixture.js) and add it to console.log 


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