fix: Roll back sessions v2

[robbie-c]

Problem

There's been some issues with sessions v2, regarding the backfill. Let's revert until we can figure out what the problem was.

Changes

Put users with the auto setting back on v1

Does this work well for both Cloud and self-hosted?

Yes

How did you test this code?

n/a We're reverting to what this used to be

[posthog-bot]

Hey @robbie-c! 👋
This pull request seems to contain no description. Please add useful context, rationale, and/or any other information that will help make sense of this change now and in the distant Mars-based future.

[sentry-io]

🔍 Existing Issues For Review

Your pull request is modifying functions with the following pre-existing issues:

📄 File: posthog/hogql/database/database.py

Function	Unhandled Issue
create_hogql_database	KeyError: 'all_data_target_new' posthog.tasks.tas... Event Count: 1
create_hogql_database	KeyError: 'test' posthog.tasks.tasks.process_quer... Event Count: 1

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