OCR must not be in the RECAP upload path

[mlissner]

Yesterday, a superseding indictment was filed against the former president, and today I'm struggling to get it uploaded. The problem? It is long and needs OCR. The old flow, from before #2720, from a user's perspective:

• Uploads were always fast.
• Upload notifications came quickly.
• Refreshing the page in CL had the document quickly.

Now:

• Uploads wait for a lot of processing to happen, which can take minutes or more.
• Upload notifications come way after an upload, and are untethered from the upload. Sometimes when they come, you go, "Wait, what the heck is this?"
• Refreshing the page in CL doesn't show the document until OCR finishes.

We need to at least get OCR out of the upload path. It's not great that I'm struggling to upload a historical document today.

@ttys0dev, I think my approach would be to move OCR back to a celery task. What do you think? Would you have time to take this on?

[mlissner]

For reference, I started uploading the doc a while before writing this ticket. It's still not done! 60 pages of OCR takes quite a while.

[mlissner]

Fixed via #2969