Add Hide/Show all checks button to commit status check (#26284)

Step one for a GitHub like commit status check ui:

![image](22953b88-1f91-4d19-bc57-ad92d33fa11f)

![image](78572a49-c9b0-472b-86a8-8293197e807b)

![image](bc5c8d1c-2ab5-4b03-b8c6-20c34b86d856)

Step two:

![image](938b359e-8823-4192-b82d-55fa40b986fd)

![image](2de5bb8f-40f5-462a-8d6d-bac13a32bc2a)

The design now will list all commit status checks which takes too much
space.
This is a pre-improve for #26247

---------

Co-authored-by: delvh <dev.lh@web.de>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

web_src/js/features/repo-legacy.js

@@ -20,6 +20,7 @@ import {initCommentContent, initMarkupContent} from '../markup/content.js';
 import {initCompReactionSelector} from './comp/ReactionSelector.js';
 import {initRepoSettingBranches} from './repo-settings.js';
 import {initRepoPullRequestMergeForm} from './repo-issue-pr-form.js';
+import {initRepoPullRequestCommitStatus} from './repo-issue-pr-status.js';
 import {hideElem, showElem} from '../utils/dom.js';
 import {getComboMarkdownEditor, initComboMarkdownEditor} from './comp/ComboMarkdownEditor.js';
 import {attachRefIssueContextPopup} from './contextpopup.js';
@@ -546,6 +547,7 @@ export function initRepository() {
     initCompReactionSelector($(document));
 
     initRepoPullRequestMergeForm();
+    initRepoPullRequestCommitStatus();
   }
 
   // Pull request