Use fetch helpers instead of fetch (#27026)

WIP because:

- [x] Some calls set a `content-type` but send no body, can likely
remove the header
- [x] Need to check whether `charset=utf-8` has any significance on the
webauthn calls, I assume not as it is the default for json content.
- [x] Maybe `no-restricted-globals` is better for eslint, but will
require a lot of duplication in the yaml or moving eslint config to a
`.js` extension.
- [x] Maybe export `request` as `fetch`, shadowing the global.

web_src/js/features/common-issue-list.js

@@ -1,7 +1,8 @@
 import $ from 'jquery';
 import {isElemHidden, onInputDebounce, toggleElem} from '../utils/dom.js';
-const {appSubUrl} = window.config;
+import {GET} from '../modules/fetch.js';
 
+const {appSubUrl} = window.config;
 const reIssueIndex = /^(\d+)$/; // eg: "123"
 const reIssueSharpIndex = /^#(\d+)$/; // eg: "#123"
 const reIssueOwnerRepoIndex = /^([-.\w]+)\/([-.\w]+)#(\d+)$/;  // eg: "{owner}/{repo}#{index}"
@@ -54,7 +55,7 @@ export function initCommonIssueListQuickGoto() {
     // try to check whether the parsed goto link is valid
     let targetUrl = parseIssueListQuickGotoLink(repoLink, searchText);
     if (targetUrl) {
-      const res = await fetch(`${targetUrl}/info`);
+      const res = await GET(`${targetUrl}/info`);
       if (res.status !== 200) targetUrl = '';
     }