Fix compatibility with node < 14.18 (#3908)

Node 14 versions prior to 14.18 do not support require statements with
`node:` prefix.

integration-tests/profiler.spec.js

@@ -8,10 +8,10 @@ const childProcess = require('child_process')
 const { fork } = childProcess
 const path = require('path')
 const { assert } = require('chai')
-const fs = require('node:fs/promises')
-const fsync = require('node:fs')
-const net = require('node:net')
-const zlib = require('node:zlib')
+const fs = require('fs/promises')
+const fsync = require('fs')
+const net = require('net')
+const zlib = require('zlib')
 const { Profile } = require('pprof-format')
 const semver = require('semver')
 

integration-tests/profiler/nettest.js

@@ -1,5 +1,4 @@
-const net = require('node:net')
-const process = require('node:process')
+const net = require('net')
 
 async function streamToString (stream) {
   const chunks = []

packages/dd-trace/src/profiling/profilers/events.js

@@ -1,4 +1,4 @@
-const { performance, constants, PerformanceObserver } = require('node:perf_hooks')
+const { performance, constants, PerformanceObserver } = require('perf_hooks')
 const { END_TIMESTAMP_LABEL } = require('./shared')
 const semver = require('semver')
 const { Function, Label, Line, Location, Profile, Sample, StringTable, ValueType } = require('pprof-format')

packages/dd-trace/src/profiling/profilers/shared.js

@@ -1,6 +1,6 @@
 'use strict'
 
-const { isMainThread, threadId } = require('node:worker_threads')
+const { isMainThread, threadId } = require('worker_threads')
 
 const END_TIMESTAMP_LABEL = 'end_timestamp_ns'
 const THREAD_NAME_LABEL = 'thread name'