Copy citation file content, in APA and BibTex format, on repo home page (#19999)

Add feature to easily copy CITATION.cff content in APA and BibTex format.

web_src/js/features/repo-legacy.js

@@ -21,6 +21,7 @@ import {
   initRepoCommonFilterSearchDropdown,
   initRepoCommonLanguageStats,
 } from './repo-common.js';
+import {initCitationFileCopyContent} from './citation.js';
 import {initCompLabelEdit} from './comp/LabelEdit.js';
 import {initRepoDiffConversationNav} from './repo-diff.js';
 import attachTribute from './tribute.js';
@@ -505,6 +506,7 @@ export function initRepository() {
   }
 
   initRepoCloneLink();
+  initCitationFileCopyContent();
   initRepoCommonLanguageStats();
   initRepoSettingBranches();