fix: fetch GitHub PR author name, fixes #7232 (#7253)

Reverts the change to `getPullRequestAuthor` in the GitHub backend from
4f419dd, so that it fetches the PR author's name as before. In the AWS
Cognito GitHub backend, return the GitHub login as the PR author.

Co-authored-by: Martin Jagodic <jagodicmartin1@gmail.com>

packages/decap-cms-backend-aws-cognito-github-proxy/src/implementation.tsx

@@ -5,6 +5,7 @@ import AuthenticationPage from './AuthenticationPage';
 
 import type { GitHubUser } from 'decap-cms-backend-github/src/implementation';
 import type { Config } from 'decap-cms-lib-util/src';
+import type { Octokit } from '@octokit/rest';
 
 export default class AwsCognitoGitHubProxyBackend extends GitHubBackend {
   constructor(config: Config, options = {}) {
@@ -44,4 +45,8 @@ export default class AwsCognitoGitHubProxyBackend extends GitHubBackend {
     }
     return this._currentUserPromise;
   }
+
+  async getPullRequestAuthor(pullRequest: Octokit.PullsListResponseItem) {
+    return pullRequest.user?.login;
+  }
 }

packages/decap-cms-backend-github/src/API.ts

@@ -580,7 +580,7 @@ export default class API {
     }
 
     try {
-      const user = await this.user();
+      const user: GitHubUser = await this.request(`/users/${pullRequest.user.login}`);
       return user.name || user.login;
     } catch {
       return;