Add fetch wrappers, ignore network errors in actions view (#26985)

1. Introduce lightweight `fetch` wrapper functions that automatically
sets csfr token, content-type and use it in `RepoActionView.vue`.
2. Fix a specific issue on `RepoActionView.vue` where a fetch network
error is shortly visible during page reload sometimes. It can be
reproduced by F5-in in quick succession on the actions view page and was
also producing a red error box on the page.

Once approved, we can replace all current `fetch` uses in UI with this
in another PR.

---------

Co-authored-by: Giteabot <teabot@gitea.io>

web_src/js/modules/fetch.js

@@ -0,0 +1,38 @@
+import {isObject} from '../utils.js';
+
+const {csrfToken} = window.config;
+
+// fetch wrapper, use below method name functions and the `data` option to pass in data
+// which will automatically set an appropriate content-type header. For json content,
+// only object and array types are currently supported.
+function request(url, {headers, data, body, ...other} = {}) {
+  let contentType;
+  if (!body) {
+    if (data instanceof FormData) {
+      contentType = 'multipart/form-data';
+      body = data;
+    } else if (data instanceof URLSearchParams) {
+      contentType = 'application/x-www-form-urlencoded';
+      body = data;
+    } else if (isObject(data) || Array.isArray(data)) {
+      contentType = 'application/json';
+      body = JSON.stringify(data);
+    }
+  }
+
+  return fetch(url, {
+    headers: {
+      'x-csrf-token': csrfToken,
+      ...(contentType && {'content-type': contentType}),
+      ...headers,
+    },
+    ...(body && {body}),
+    ...other,
+  });
+}
+
+export const GET = (url, opts) => request(url, {method: 'GET', ...opts});
+export const POST = (url, opts) => request(url, {method: 'POST', ...opts});
+export const PATCH = (url, opts) => request(url, {method: 'PATCH', ...opts});
+export const PUT = (url, opts) => request(url, {method: 'PUT', ...opts});
+export const DELETE = (url, opts) => request(url, {method: 'DELETE', ...opts});

web_src/js/modules/fetch.test.js

@@ -0,0 +1,11 @@
+import {test, expect} from 'vitest';
+import {GET, POST, PATCH, PUT, DELETE} from './fetch.js';
+
+// tests here are only to satisfy the linter for unused functions
+test('exports', () => {
+  expect(GET).toBeTruthy();
+  expect(POST).toBeTruthy();
+  expect(PATCH).toBeTruthy();
+  expect(PUT).toBeTruthy();
+  expect(DELETE).toBeTruthy();
+});