spike: support node@16 lts

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Node 16 LTS was released at the end of October 2021. It will work with existing CLI releases, but we aren't explicity testing it. This PR adds Node 16 to our CI pipeline to ensure everything we test for continues working.

To Do

• Fix analytics error
  • fix: ignore analytics request failures #2346
• Handle unhandled rejection
  • fix: handle unexpected errors #2368
• Update pipelines to run against Node 16
• Fix failing tests
  • test: migrate cli-server to fake-server #2409

After Merge

1. Deprecate Node 10
2. Upgrade to npm 8
3. Upgrade binaries

npm 8 and Node 10

Node 16 ships with npm 8. npm 8 dropped support for Node 10 and fails if it's detected. This means we cannot run builds and tests against a Node 10 environment. Node 10 is deprecated and is no longer maintained.

So to properly support Node 16 in the future, we'll need to drop Node 10. For now, we can downgrade to npm 7.

[github-actions]

	Warnings
⚠️	Since the CLI is unifying on a standard and improved tooling, we're starting to migrate old-style imports and exports to ES6 ones. A file you've modified is using either module.exports or require(). If you can, please update them to ES6 import syntax and export syntax. Files found: src/cli/index.ts

	Messages
📖	You are modifying something in test/smoke directory, yet you are not on the branch starting with smoke/. You can prefix your branch with smoke/ and Smoke tests will trigger for this PR.

Generated by 🚫 dangerJS against ff82a3c

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This PR modifies files linked to issues tracked in Stepsize.

You might want to review their status, priority, and scope.

• ✅  2 http libraries in CLI
  • src/cli/index.ts

_{Mention [stepsize] in a comment if you'd like to report some technical debt. See examples here.}