{Misc} az version: GA

[jiasli]

Description
Make az version from #11680 GA. Otherwise the preview warning breaks the terminal color when calling

Measure-Command {az version}

We need to run/demo this line for performance baseline evaluation.

Besides, the command is already stable.

Testing Guide

> az version
{
  "azure-cli": "2.3.1",
  "azure-cli-command-modules-nspkg": "2.0.3",
  "azure-cli-core": "2.3.1",
  "azure-cli-nspkg": "3.0.4",
  "azure-cli-telemetry": "1.0.4",
  "azure-cli-testsdk": "0.2.4",
  "extensions": {
    "interactive": "0.4.4",
    "support": "0.1.1",
    "timeseriesinsights": "0.1.0"
  }
}

> Measure-Command {az version}

Days              : 0
Hours             : 0
Minutes           : 0
Seconds           : 2
Milliseconds      : 80
Ticks             : 20807594
TotalDays         : 2.40828634259259E-05
TotalHours        : 0.000577988722222222
TotalMinutes      : 0.0346793233333333
TotalSeconds      : 2.0807594
TotalMilliseconds : 2080.7594

[yonzhan]

add to S168