refactor(dev-infra): share more github code between commands (#38656)

Instead of repeating the logic for adding the github token to
a repository git url, we add a shared function for automatically
computing the URls with token.

Additionally, URLs for updating/generating tokens have been moved
to a dedicated file in the `utils` folder. Also while being at it,
the yargs github token helper is also moved into the dedicated
Git/Github related util folder.

PR Close #38656

dev-infra/utils/git/github-urls.ts

@@ -0,0 +1,36 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+
+import {URL} from 'url';
+import {GithubConfig} from '../config';
+
+/** URL to the Github page where personal access tokens can be managed. */
+export const GITHUB_TOKEN_SETTINGS_URL = `https://github.com/settings/tokens`;
+
+/** URL to the Github page where personal access tokens can be generated. */
+export const GITHUB_TOKEN_GENERATE_URL = `https://github.com/settings/tokens/new`;
+
+/** Adds the provided token to the given Github HTTPs remote url. */
+export function addTokenToGitHttpsUrl(githubHttpsUrl: string, token: string) {
+  const url = new URL(githubHttpsUrl);
+  url.username = token;
+  return url.toString();
+}
+
+/** Gets the repository Git URL for the given github config. */
+export function getRepositoryGitUrl(config: GithubConfig, githubToken?: string): string {
+  if (config.useSsh) {
+    return `git@github.com:${config.owner}/${config.name}.git`;
+  }
+  const baseHttpUrl = `https://github.com/${config.owner}/${config.name}.git`;
+  if (githubToken !== undefined) {
+    return addTokenToGitHttpsUrl(baseHttpUrl, githubToken);
+  }
+  return baseHttpUrl;
+}