fix(ext/node): set process fields on own instance (#27927)

Ref #27891 (comment)

```
% deno eval 'console.log(Object.getOwnPropertyNames(process))'
[
  "_events",
  "_eventsCount",
  "_maxListeners",
  "versions",
  "stdin",
  "stdout",
  "stderr"
]

% target/debug/deno eval 'console.log(Object.getOwnPropertyNames(process))'
[
  "_events",
  "_eventsCount",
  "_maxListeners",
  "release",
  "arch",
  "report",
  "title",
  "argv",
  "argv0",
  "chdir",
  "config",
  "cpuUsage",
  "cwd",
  "env",
  "execArgv",
  "exit",
  "abort",
  "reallyExit",
  "_exiting",
  "exitCode",
  "mainModule",
  "nextTick",
  "dlopen",
  "pid",
  "ppid",
  "platform",
  "setSourceMapsEnabled",
  "hrtime",
  "_kill",
  "kill",
  "memoryUsage",
  "stderr",
  "stdin",
  "stdout",
  "version",
  "versions",
  "emitWarning",
  "binding",
  "umask",
  "getgid",
  "getuid",
  "getegid",
  "geteuid",
  "getBuiltinModule",
  "_eval",
  "execPath",
  "uptime",
  "allowedNodeEnvironmentFlags",
  "features",
  "noDeprecation"
]
```