vscode-powershell: PowerShell extension (and Integrated Console) never starts

System Details

System Details Output

### VSCode version: 1.30.1 dea8705087adb1b5e5ae1d9123278e178656186a x64

### VSCode extensions:
christian-kohler.npm-intellisense@1.3.0
christian-kohler.path-intellisense@1.4.2
CoenraadS.bracket-pair-colorizer@1.0.61
DavidAnson.vscode-markdownlint@0.22.0
dbaeumer.vscode-eslint@1.7.2
eg2.vscode-npm-script@0.3.5
jasonnutter.search-node-modules@1.3.0
jebbs.plantuml@2.10.1
ms-mssql.mssql@1.4.0
ms-vscode.csharp@1.17.1
ms-vscode.PowerShell@1.10.2
rebornix.ruby@0.21.0
waderyan.nodejs-extension-pack@0.1.9
xabikos.JavaScriptSnippets@1.7.2
yzhang.markdown-all-in-one@1.8.0


### PSES version:

### PowerShell version:

Name                           Value
----                           -----
PSVersion                      5.1.16299.666
PSEdition                      Desktop
PSCompatibleVersions           {1.0, 2.0, 3.0, 4.0...}
BuildVersion                   10.0.16299.666
CLRVersion                     4.0.30319.42000
WSManStackVersion              3.0
PSRemotingProtocolVersion      2.3
SerializationVersion           1.1.0.1

Issue Description

All right click console options fail (i.e. Run Selection).

Expected Behaviour

If I highlight code and press F8 (or right click and Run Selection), I expect the command(s) to be run in the terminal window.

Actual Behaviour

A pop-up appears stating <ConsoleFeature>: Unable to instantiate; language client undefined.

Attached Logs

There are no logs in the extension logs folder (even with logs set to Diagnostic) and the lines below are the only output in the PowerShell Extension console:

12/26/2018 10:34:57 AM [NORMAL] - Visual Studio Code v1.30.1 64-bit
12/26/2018 10:34:57 AM [NORMAL] - PowerShell Extension v1.10.2
12/26/2018 10:34:57 AM [NORMAL] - Operating System: Windows 64-bit
12/26/2018 10:35:10 AM [ERROR] - <ConsoleFeature>: Unable to instantiate; language client undefined.