Feature Request: Allow users to set their Stripe API version

Feature request

Is your feature request related to a problem?

We currently have a relatively old version of the Stripe API hardcoded: https://github.com/PostHog/posthog/blob/b49cf7ce821aaf411405d033270b12945af29239/posthog/temporal/data_imports/sources/stripe/stripe.py#L66.

This can lead to inconsistent results, as the schema may change across versions, leading to discrepancies with what users see in other systems outside PostHog.

Describe the solution you'd like

Let users set their desired Stripe API version.

Additional context

From: https://posthoghelp.zendesk.com/agent/tickets/52385 (moved to PostHog: https://us.posthog.com/project/2/support/tickets/54200)

Debug info

Kind: bug

Target area: data_warehouse

Report event: http://go/ticketByUUID/4d6c9d95-bff3-4e1c-aab1-19770ca3b8cf

Session: https://us.posthog.com/project/sTMFPsFhdP1Ssg/replay/019cb899-2172-7814-86f8-0e50a2d22a66?t=3967

Exceptions: https://us.posthog.com/project/2/error_tracking?filterGroup=%7B%22type%22%3A%22AND%22%2C%22values%22%3A%5B%7B%22type%22%3A%22AND%22%2C%22values%22%3A%5B%7B%22key%22%3A%22%24session_id%22%2C%22value%22%3A%5B%22019cb899-2172-7814-86f8-0e50a2d22a66%22%5D%2C%22operator%22%3A%22exact%22%2C%22type%22%3A%22event%22%7D%5D%7D%5D%7D

Location: https://us.posthog.com/project/240542/ai?chat=eeb22e84-1d7b-4cc3-955d-a84787f1dd62

Persons-on-events mode for project: person_id_override_properties_on_events

Start by reading posthog/temporal/data_imports/sources/stripe/stripe.py around line 66 to understand where the API version is hardcoded and how Stripe imports are configured. Trace the relevant user-facing configuration path, then verify that a selected version is used for imports instead of the fixed version and that existing behavior remains unchanged by default.