Fix Linux Image

We need to migrate to the new Linux image in CI so we can run tests on Linux again.
#2557
This PR initially had the changes but it should really be an isolated fix - was intending to put it there to improve PR merge velocity

Author: nagilson

1pr-azure-pipeline.yml

@@ -31,7 +31,7 @@ parameters:
     os: windows
     emoji: 🪟
   - name: NetCore-Public
-    demands: ImageOverride -equals 1es-ubuntu-2004-open
+    demands: ImageOverride -equals build.ubuntu.2204.amd64.open
     os: linux
     emoji: 🐧
   - name: Azure Pipelines

pipeline-templates/build-test.yaml

@@ -32,6 +32,10 @@ jobs:
     - script: test.cmd
       displayName: 🔍 Test Windows
   - ${{ if eq(parameters.pool.os, 'linux') }}:
+    - bash: |
+        sudo apt-get update
+        sudo apt-get install -y libgbm1 xvfb libnss3 libatk-bridge2.0-0 libatk1.0-0 libgtk-3-0 libgbm-dev libxkbcommon-x11-0 libdrm2 libx11-xcb1 libasound2
+      displayName: 📦 Install VS Code dependencies
     - bash: |
         /usr/bin/Xvfb :99 -screen 0 1024x768x24 > /dev/null 2>&1 &
         echo ">>> Started xvfb"

vscode-dotnet-runtime-library/src/test/mocks/MockEnvironmentVariableCollection.ts

@@ -7,6 +7,7 @@ import * as vscode from 'vscode';
 export class MockEnvironmentVariableCollection implements vscode.EnvironmentVariableCollection {
 
     public persistent =  true;
+    public description: string | vscode.MarkdownString | undefined = undefined;
     public variables: {[variable: string]: string} = {};
 
     public append(variable: string, value: string): void {

vscode-dotnet-runtime-library/src/test/unit/LinuxDistroTests.test.ts

@@ -21,7 +21,7 @@ const standardTimeoutTime = 100000;
 const mockVersion = '8.0.103';
 const acquisitionContext = getMockAcquisitionContext('sdk', mockVersion);
 const mockExecutor = new MockCommandExecutor(acquisitionContext, getMockUtilityContext());
-const pair: DistroVersionPair = { distro: UBUNTU_DISTRO_INFO_KEY, version: '24.04' };
+const pair: DistroVersionPair = { distro: UBUNTU_DISTRO_INFO_KEY, version: '22.04' };
 const provider: GenericDistroSDKProvider = new GenericDistroSDKProvider(pair, acquisitionContext, getMockUtilityContext(), mockExecutor);
 const shouldRun = os.platform() === 'linux';
 const installType: DotnetInstallMode = 'sdk';

vscode-dotnet-runtime-library/src/test/unit/TestUtility.ts

@@ -147,11 +147,7 @@ export async function getLinuxSupportedDotnetSDKVersion(context: IAcquisitionWor
     {
         if (distroInfo.version < '22.04')
         {
-            return '9.0.100';
-        }
-        if (distroInfo.version < '22.06')
-        {
-            return '9.0.100';
+            return '7.0.100';
         }
         if (distroInfo.version < '24.04')
         {