• Identified the issue which this PR solves.
• Read the CONTRIBUTING document.
• Code builds clean without any errors or warnings.
• Added appropriate tests for any new functionality.
• All new and existing tests passed.
• Added comments in the code, where necessary.
• Ran make check to catch common errors. Fixed any that came up.

Description:
This PR resolves a number of warnings given in the npm package install including:

• remove babel-eslint in favor of @typescript-eslint/parser
• standard 16.0.0 and eslint-config-standard 16.0.0 no longer require the eslint-plugin-standard package. You can remove it. More info here: Eliminate eslint-plugin-standard standard/standard#1316
• [email protected]: This package has been renamed to "react-countdown".
• @types/[email protected]: This is a stub types definition. classnames provides its own type definitions, so you do not need this installed.

This will help with maintenance and decrease the number of security warnings we get from stale packages.

Review guide:

• first, checkout branch and run yarn
• make sure yarn run lint works
• make sure yarn workspaces run check works
• make sure the countdown on alert details works (X seconds until next escalation)