Fix expected test output for Windows tests

Author: mbg

csharp/ql/integration-tests/windows-only/diag_autobuild_script/diagnostics.expected

@@ -19,7 +19,7 @@
   "helpLinks": [],
   "internal": false,
   "location": {},
-  "plaintextMessage": "CodeQL could not find any project or solution files in your repository. Set up a [manual build command](https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-the-codeql-workflow-for-compiled-languages).",
+  "markdownMessage": "CodeQL could not find any project or solution files in your repository. Set up a [manual build command](https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-the-codeql-workflow-for-compiled-languages).",
   "severity": "error",
   "source": {
     "extractorName": "csharp",

csharp/ql/integration-tests/windows-only/diag_multiple_scripts/diagnostics.expected

@@ -3,12 +3,12 @@
   "helpLinks": [],
   "internal": false,
   "location": {},
-  "markdownMessage": "CodeQL found multiple potential build scripts for your project and attempted to run `build.bat`, which failed. This may not be the right build script for your project. Set up a [manual build command](https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-the-codeql-workflow-for-compiled-languages).",
+  "markdownMessage": "CodeQL could not find any project or solution files in your repository. Set up a [manual build command](https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-the-codeql-workflow-for-compiled-languages).",
   "severity": "error",
   "source": {
     "extractorName": "csharp",
-    "id": "csharp/autobuilder/multiple-build-scripts",
-    "name": "There are multiple potential build scripts"
+    "id": "csharp/autobuilder/no-projects-or-solutions",
+    "name": "No project or solutions files found"
   },
   "visibility": {
     "statusPage": true
@@ -19,12 +19,12 @@
   "helpLinks": [],
   "internal": false,
   "location": {},
-  "plaintextMessage": "CodeQL could not find any project or solution files in your repository. Set up a [manual build command](https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-the-codeql-workflow-for-compiled-languages).",
+  "markdownMessage": "CodeQL found multiple potential build scripts for your project and attempted to run `build.bat`, which failed. This may not be the right build script for your project. Set up a [manual build command](https://docs.github.com/en/code-security/code-scanning/automatically-scanning-your-code-for-vulnerabilities-and-errors/configuring-the-codeql-workflow-for-compiled-languages).",
   "severity": "error",
   "source": {
     "extractorName": "csharp",
-    "id": "csharp/autobuilder/no-projects-or-solutions",
-    "name": "No project or solutions files found"
+    "id": "csharp/autobuilder/multiple-build-scripts",
+    "name": "There are multiple potential build scripts"
   },
   "visibility": {
     "statusPage": true