fix: correct filename extension for codecov configuration in diff settings

Author: vmelamed

templates/AddNewPackage/content/diff-common.custom.json

@@ -11,13 +11,12 @@
         ".editorconfig": "copy",
         ".gitattributes": "copy",
         ".gitignore": "copy",
-        "codecov.yml": "copy",
+        "codecov.yaml": "copy",
         "Directory.Build.props": "copy",
         "Directory.Packages.props": "copy",
         "global.json": "copy",
         "LICENSE": "copy",
         "NuGet.config": "copy",
-        "test.runsettings": "copy",
         ".github/dependabot.yml": "copy",
         ".github/workflows/ClearCache.yaml": "copy",
         ".github/workflows/CI.yaml": "ask to merge",