Fix follow ups in thread + fix user name

[Weves]

Description

1. Fixes follow ups in threads. A table was missing, which caused follows ups to fail (SQLAlchemy tries accessing a table that doesn't exist).
2. Improves the prompt. Previously was a bit nasty (e.g. the final query would look like nQUERY:\nChris Weaver said in Slack:\nhi' which caused weird answers). Moves back to the single message history that happens before the task prompt + removes the X said in Slack part before the final query to simplify the tasks for the LLM.

How Has This Been Tested?

Tested follow-ups, directly in channel, search assistant in web UI, and general assistant in web UI.

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 16, 2025 2:15am