• Assign codes to the handful of errors reported by internal/process/*.js
• Include documentation for the new error codes
• Improve error messages
• Improve test coverage for process.nextTick

Ref: #11273

Semver-major because this updates specific error messages and converts errors over to use the new internal/errors.js mechanism.

Checklist

• make -j4 test (UNIX), or vcbuild test (Windows) passes
• tests and/or benchmarks are included
• documentation is changed or added
• commit message follows commit guidelines

Affected core subsystem(s)

errors, process