Replace FileUploadHandler::loadByUri() with FileRepositoryInterface::loadByUri()

I don't think we eventually need a CR, right? This method is protected

See a few more instances of ->loadByUri in core. Also issue summary needs to updated to include that the proposed solution is to deprecate and API changes.

There only appear to be about 10 instances in core. Wonder if this counts as deprecating in D11.

Based on slack conversation think this is good.

Cleaned up remaining tasks in IS

Looks straightforward.

Committed 5294815 and pushed to 11.x. Thanks!

longwave → closed merge request !5849

Issue status does not want to change.

Should the CR be published?

Yes, whoops, done that as well - thanks!

Automatically closed - issue fixed for 2 weeks with no activity.