(DOCSP-39165) Node and RN: Change baseURL during runtime

[krollins-mdb]

Pull Request Info

Jira ticket: https://jira.mongodb.org/browse/DOCSP-39165

• Node.js: Connect to an Atlas App Services Backend
• React Native: Connect to an Atlas App Services App

This PR adds content to both the Node.js and React Native SDKs for changing the base URL during runtime. However, it only includes examples for the Node.js SDK. Right now, the experimental module does not really work for React Native. So, the React Native content notes that this feature exists, but is experimental and points to the Node.js content.

Sorry for the large number of changed files. I couldn't resist removing an old React Native app that we weren't using for anything.

Build errors:

• There's a build error about not being able to find label:node-change-server-during-runtime. Manually testing shows the ref link working.
• Looks like there are a couple flaky React Native tests. They're unrelated to any changes I've made. I'll need to set aside time to look at them later.

Reminder Checklist

Before merging your PR, make sure to check a few things.

• [x] Did you tag pages appropriately?
  • genre
  • meta.keywords
  • meta.description
• [x] Describe your PR's changes in the Release Notes section
• [x] Create a Jira ticket for related docs-app-services work, if any

Release Notes

• Node.js SDK
  • App Services/Connect to an Atlas App Services Backend: Add new sections and examples for updating the baseUrl, including during runtime.
• React Native SDK
  • App Services/Connect to an Atlas App Services App: Add new sections that address updating the baseUrl.

Review Guidelines

REVIEWING.md

Animal Wearing a Hat

[github-actions[bot]]

Readability for Commit Hash: a4bb7e36939576d6384828d078d9d1214e95be27

You can see any previous Readability scores (if they exist) by looking at the comment's history.

Readability scores for changed documents:

• source/sdk/react-native/app-services/connect-to-app-services-app: Grade Level: 7.5, Reading Ease: 60.61
• source/sdk/node/app-services/connect-to-app-services-backend: Grade Level: 8.1, Reading Ease: 58.89

For Grade Level, aim for 8 or below.

For Reading Ease scores, aim for 60 or above:

Score	Difficulty
90-100	Very Easy
80-89	Easy
70-79	Fairly Easy
60-69	Medium
50-59	Fairly Hard
30-49	Hard
0-29	Very Hard

For help improving readability, try Hemingway App.

[docs-builder-bot]

✨ Staging URL: https://preview-mongodbmongodb.gatsbyjs.io/realm/master/

🪵 Logs

• job log: 085c08e0c73b1c765ac6244348ea6d52c36e205c