Feature Request: Make it clearer that OS version might not be accurate

Feature request

Is your feature request related to a problem?

The macOS version reported in browsers is capped at 10.15.7 (the last version of macOS Catalina). We derive OS version from user agent, so the version we're reporting is now usually unreliable.

It would be good to make this clearer in the PostHog UI (or consider stopping reporting of the property altogether).

Additional context

From: https://posthoghelp.zendesk.com/agent/tickets/39084 (moved to PostHog: https://us.posthog.com/project/2/support/tickets/40818)

Debug info

Kind: support

Target area: analytics

Report event: http://go/ticketByUUID/0ab7219a-0061-4f32-85d2-da426380059c

Session: https://us.posthog.com/project/sTMFPsFhdP1Ssg/replay/0199a270-0d0c-72a1-9226-f48adf31bae7?t=2374

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%220199a270-0d0c-72a1-9226-f48adf31bae7%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/38983/persons/018b69e6-a45a-0000-e118-3b3359c01198

Persons-on-events mode for project: person_id_override_properties_joined

Start with packages/browser/src/utils/user-agent-utils.ts, especially the user-agent OS version derivation linked in the issue, and trace where this property is displayed in the PostHog UI. Determine whether the UI should clearly qualify the macOS version or whether reporting it should stop; done means the chosen behavior is implemented and covered by the relevant checks.