Bug 1761432 - Part 1: Rename ScriptLoadRequest progress enum to 'State' r=smaug

This also renames 'loading' enum values to 'fetching' since this is more
specific. Loading covers the whole process of loading, which includes the other
states.

Enum values have the leading 'e' removed in line with the coding style for enum
classes.

Differential Revision: https://phabricator.services.mozilla.com/D142041

js/loader/ModuleLoaderBase.cpp

@@ -470,7 +470,7 @@ void ModuleLoaderBase::StartFetchingModuleDependencies(
   auto visitedSet = aRequest->mVisitedSet;
   MOZ_ASSERT(visitedSet->Contains(aRequest->mURI));
 
-  aRequest->mProgress = ModuleLoadRequest::Progress::eFetchingImports;
+  aRequest->mState = ModuleLoadRequest::State::LoadingImports;
 
   nsCOMArray<nsIURI> urls;
   nsresult rv = ResolveRequestedModules(aRequest, &urls);