Do not perform a design time build when .editorconfig files are modified

[JoeRobich]

It would suffice to update the AnalyzerConfigDocuments in the CurrentSolution. The current implementation can cause build loops as SourceGenerators can generate .editorconfig files on disk from on MSBuild properties. See dotnet/aspnetcore#30750

omnisharp-roslyn/src/OmniSharp.MSBuild/ProjectManager.cs

Lines 390 to 412 in 4510973

	if (_workspace.EditorConfigEnabled)
	{
	// Watch beneath the Project folder for changes to .editorconfig files.
	_fileSystemWatcher.Watch(".editorconfig", (file, changeType) =>
	{
	QueueProjectUpdate(projectFileInfo.FilePath, allowAutoRestore: false, projectFileInfo.ProjectIdInfo, file);
	});
	// Watch in folders above the Project folder for changes to .editorconfig files.
	var parentPath = Path.GetDirectoryName(projectFileInfo.FilePath);
	while (parentPath != Path.GetPathRoot(parentPath))
	{
	if (!EditorConfigFinder.TryGetDirectoryPath(parentPath, out parentPath))
	{
	break;
	}
	_fileSystemWatcher.Watch(Path.Combine(parentPath, ".editorconfig"), (file, changeType) =>
	{
	QueueProjectUpdate(projectFileInfo.FilePath, allowAutoRestore: false, projectFileInfo.ProjectIdInfo, file);
	});
	}
	}