During asset refresh, getExistingFile does not return the updated file

Problem/Motivation

something is causing delays writing to database, after a $file->save() call that updates the file entity, the new entity is not reflected on DB immediately, making the file loaded again from the DB incorrect under certain conditions, mainly making that the incorrect image styles be flushed, because it uses an outdated file uri.

Steps to reproduce

1. Create a media with a DAM asset
2. Update the asset on DAM, changing the file name
3. Add the asset to the refresh queue and execute it

Proposed resolution

Use an static variable to store in memory the File entity, so then when it is updated, subsequents calls to getExistingFile returns the same File entity from memory, no matter if it was not reflected to DB yet