Apply a proper fix to WebFunctionsManager.CreateOrUpdate for metadata refresh bug

[soninaren]

Currently a tactical hack exists in the WebFunctionsManager.CreateOrUpdate where we're not using the general IFunctionMetadataManager service to get metadata. This is due to some deep issues with worker indexing + metadata refresh that need to be fixed by larger scale refactorings.

So temporarily there's a hack in place in this method to get the majority of scenarios working again, while we work on a proper fix. Prior to this fix, this create API was nearly 100% broken, affecting mainly portal development scenarios.