MM-52642 CLD-6352 MM-54007 Prepare setup for Playwright pipeline (#24647)

* pipeline(playwright): prepare setup for playwright

* feedback address

* clean up readme

* Fix docker-compose command and definition for dashboard

* fix the dashboard

* ignore dashboard when formatting

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Co-authored-by: Mattermost Build <build@mattermost.com>
Co-authored-by: Mario Vitale <mvitale1989@hotmail.com>

e2e-tests/playwright/tests/functional/channels/search/find_channels.spec.ts

@@ -37,7 +37,6 @@ test('MM-T5424 Find channel search returns only 50 results when there are more t
     await channelsPage.toBeVisible();
 
     // # Click on "Find channel" and type "test_channel"
-    await channelsPage.centerView.headerMobile.toggleSidebar();
     await channelsPage.sidebarLeft.findChannelButton.click();
 
     await channelsPage.findChannelsModal.toBeVisible();