Downloadable status should rely on the restore expiration time

Getting Blob status from its provider seems to send downloadable false where it should be true.

Scenario:

• upload content to S3 Main bucket => Standard storage class
• move content to Glacier => after life cyle transition => Glacier storage class

Issue:

get blob status using S3BlobProvider#getStatus return true where it should be false.
this is related to the fact that the ongoing boolean is null ( three state boolean). Please note we didn’t ask for a restore

As its main storage is Standards (the Life cycle transition doesn't happen yet)

 Proposal:
we should rely on the class storage and the restore expiration time