React 17+ compatibility

[damianstasik]

New Issue Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am not just asking a question.
• [x] I have searched through existing issues.
• [x] I can reproduce the issue with the latest versions of Parse Server and Parse Dashboard.

Issue Description

We are currently using a few React features that are deprecated. If we want to upgrade to the next major React version we need to refactor the affected code.

Steps to reproduce

• [ ] Look for componentWillReceiveProps, componentWillUpdate and componentWillMount methods in the code.
• [x] Look for contextTypes property in the code.
• [x] Look for findDOMNode method invocations used for ref-like behavior.

Actual Outcome

Deprecated features are still in use.

Expected Outcome

No deprecated features are used.

Environment

n/a

Dashboard

• Parse Dashboard version: n/a
• Browser (Safari, Chrome, Firefox, Edge, etc.): n/a
• Browser version: n/a

Server

• Parse Server version: n/a
• Operating system: n/a
• Local or remote host (AWS, Azure, Google Cloud, Heroku, Digital Ocean, etc): n/a

Database

• System (MongoDB or Postgres): n/a
• Database version: n/a
• Local or remote host (MongoDB Atlas, mLab, AWS, Azure, Google Cloud, etc): n/a

Logs

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