Repository: vscode
Issue: Extension variables are not expanded in integrated terminal profiles
Labels: bug,confirmed,terminal-process

Issue Type: <b>Bug</b>

1. Install [rioj7.command-variable](https://marketplace.visualstudio.com/items?itemName=rioj7.command-variable) extension that provides additional variables.
2. Create a new terminal profile and set one environment variable `TEST_1` to `${extension.commandvariable.workspace.folderPosix}`
3. Set environment variable `TEST_2` to `${workspaceFolder}`.
4. Launch the terminal profile and check environment variables.

<details>
<summary>Example configuration</summary>

```json
{
  "terminal.integrated.profiles.windows": {
    "PowerShell": {
      "source": "PowerShell",
      "icon": "terminal-powershell"
    },
    "Command Prompt": {
      "path": [
        "${env:windir}\\Sysnative\\cmd.exe",
        "${env:windir}\\System32\\cmd.exe"
      ],
      "args": [],
      "icon": "terminal-cmd"
    },
    "Git Bash": {
      "source": "Git Bash"
    },
    "MINGW64": {
      "icon": "terminal-bash",
      "path": "D:\\Users\\Brawaru\\Software\\MSYS64\\usr\\bin\\bash.exe",
      "args": ["-l"],
      "env": {
        "MSYSTEM": "MINGW64",
        "SYSTEMDRIVE": "C:",
        "SYSTEMROOT": "C:\\Windows",
        "WINDIR": "C:\\Windows",
        "TEST_1": "${extension.commandvariable.workspace.folderPosix}",
        "TEST_2": "${workspaceFolder}"
      },
      "color": "terminal.ansiCyan",
      "overrideName": true
    }
  }
}
```

</details>

**Expected behaviour**:
`TEST_1` is expanded to current workspace path but uses POSIX separators.
`TEST_2` is expanded to current workspace path with system separators.

**Actual behaviour**:
`TEST_1` is not expanded and stays `${extension.commandvariable.workspace.folderPosix}`, only `TEST_2` is expanded to current workspace path.

VS Code version: Code 1.68.0 (4af164ea3a06f701fe3e89a2bcbb421d2026b68f, 2022-06-08T11:44:16.822Z)
OS version: Windows_NT x64 10.0.19043
Restricted Mode: No

<details>
<summary>System Info</summary>

|Item|Value|
|---|---|
|CPUs|Intel(R) Core(TM) i5-4440 CPU @ 3.10GHz (4 x 3093)|
|GPU Status|2d_canvas: enabled<br>canvas_oop_rasterization: disabled_off<br>direct_rendering_display_compositor: disabled_off_ok<br>gpu_compositing: enabled<br>multiple_raster_threads: enabled_on<br>oop_rasterization: enabled<br>opengl: enabled_on<br>rasterization: enabled<br>raw_draw: disabled_off_ok<br>skia_renderer: enabled_on<br>video_decode: enabled<br>video_encode: enabled<br>vulkan: disabled_off<br>webgl: enabled<br>webgl2: enabled|
|Load (avg)|undefined|
|Memory (System)|11.95GB (3.52GB free)|
|Process Argv|-n --crash-reporter-id 00f2bb44-44e6-48df-99e8-c8d250a1afbb|
|Screen Reader|no|
|VM|0%|
</details><details><summary>Extensions (47)</summary>

Extension|Author (truncated)|Version
---|---|---
better-comments|aar|3.0.0
vscode-zipfs|arc|3.0.0
github-markdown-preview|bie|0.3.0
markdown-checkbox|bie|0.3.2
markdown-emoji|bie|0.2.1
markdown-footnotes|bie|0.0.7
markdown-mermaid|bie|1.14.0
markdown-preview-github-styles|bie|1.0.1
markdown-yaml-preamble|bie|0.1.0
postcss|css|1.0.9
reverse-search|Dan|2.0.2
languagetool-linter|dav|0.19.0
vscode-eslint|dba|2.2.2
npm-browser|den|1.1.3
typescript-notebook|don|2.0.6
EditorConfig|Edi|0.16.4
prettier-vscode|esb|9.5.0
codespaces|Git|1.8.3
copilot-nightly|Git|1.27.6109
go|gol|0.33.1
vscode-test-explorer|hbe|2.21.1
discord-vscode|icr|5.8.0
vscode-postfix-ts|ipa|1.10.0
vscode-icon-theme|jtl|1.6.6
bash-ide-vscode|mad|1.14.0
fluent-icons|mig|0.0.17
xml-format|mik|1.1.2
jupyter|ms-|2022.5.1001601848
jupyter-renderers|ms-|1.0.8
remote-wsl|ms-|0.66.3
hexeditor|ms-|1.9.6
test-adapter-converter|ms-|0.1.6
vsliveshare|ms-|1.0.5615
vscode-yaml-sort|Pas|5.3.1
command-variable|rio|1.36.0
crates|ser|0.5.10
mdx|sil|0.1.0
datapack-language-server|SPG|3.3.32
rewrap|stk|1.16.3
code-spell-checker|str|2.2.2
code-spell-checker-russian|str|2.0.5
svelte-vscode|sve|105.17.0
even-better-toml|tam|0.14.2
shellcheck|tim|0.19.5
vscodeintellicode|Vis|1.2.21
vscode-wakatime|Wak|18.1.5
material-theme|zhu|3.13.29

(1 theme extensions excluded)

</details><details>
<summary>A/B Experiments</summary>

```
vsliv368:30146709
vsreu685:30147344
python383:30185418
vspor879:30202332
vspor708:30202333
vspor363:30204092
vstes516:30244333
vslsvsres303:30308271
pythonvspyl392:30443607
vserr242:30382549
pythontb:30283811
vsjup518:30340749
pythonvspyt551cf:30345471
pythonptprofiler:30281270
vshan820:30294714
vstes263:30335439
vscoreces:30445986
pythondataviewer:30285071
vscod805cf:30301675
binariesv615:30325510
bridge0708:30335490
bridge0723:30353136
vsaa593:30376534
vsc1dst:30438360
pythonvs932:30410667
wslgetstarted:30449410
vscscmwlcmt:30465135
cppdebug:30492333
vsclangdc:30486549

```

</details>

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