This might be a terrible way to do it. But I simply go ahead and make the name change and then the next morning monitor the QMC to see all of the reloads that failed. Then I fix them and reload them.
I don't know of any way to scan the entire system and search for something like a file name in every script.
There might be an extension that you could run each app at a time to see the contents.
I like Marks method!
you could try
There are also paid versions that will include qliksense.
There is also Rob Wunderlichs script log analyser you could search for the qvd reference in the script
Two tools that will provide Lineage info for Qlik Sense:
Qlik Sense Governance Collector - Open Source
And as Thomas suggested, you can log your script logs into my Qlikview Cookbook: Script Log Analyzer http://qlikviewcookbook.com/recipes/download-info/script-log-analyzer/ tool
or just search the logfile directory for the QVD name.