MM-62558 Add E2E tests for custom profile settings (#30722)

* add e2e tests for custom profile settings

* fix failed tests

* reorg folder and file convention, and add more details of the tests

---------

Co-authored-by: Mattermost Build <build@mattermost.com>

e2e-tests/playwright/specs/functional/channels/gif_picker/gif_picker_search.spec.ts

@@ -34,7 +34,7 @@ test.fixme(
         await channelsPage.centerView.postCreate.sendMessage();
 
         // * Verify that last message has the gif
-        const lastPost = await channelsPage.centerView.getLastPost();
+        const lastPost = await channelsPage.getLastPost();
         await lastPost.toBeVisible();
         await expect(lastPost.body.getByLabel('file thumbnail')).toHaveAttribute('alt', altOfFirstSearchGifResult);
     },
@@ -56,7 +56,7 @@ test.fixme(
         await channelsPage.centerView.postCreate.postMessage('Message to open RHS');
 
         // # Open the last post sent in RHS
-        const lastPost = await channelsPage.centerView.getLastPost();
+        const lastPost = await channelsPage.getLastPost();
         await lastPost.hover();
         await lastPost.postMenu.toBeVisible();
         await lastPost.postMenu.reply();