Auth fix + Registration Clarity

[pablonyx]

Description

• User registration clarity: Updated email and pre-populated auth page with their email
• Make sure each new transaction immediately sets the schema (search_path) to the tenant’s schema in async session
• Needed a workaround-ish solution for the above- "after_begin" since we can't use direct async awaits.

Fixes https://linear.app/danswer/issue/DAN-1232/cloud-user-invite-not-working

Previously, we did this somewhat manually since FastAPI Users manually commits the transaction for the user db in various places. This led to some inconsistencies in auth flows

How Has This Been Tested?

• Invite and login as a previously external permission user and Slack user
• Login and register in multi tenant scenario

Backporting (check the box to trigger backport action)

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• This PR should be backported (make sure to check that the backport attempt succeeds)

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Name	Status	Preview	Comments	Updated (UTC)
internal-search	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jan 5, 2025 5:23pm