fix(data-warehouse): Add support for sampling views on postgres

[Gilbert09]

Problem

• We're running TABLESAMPLE queries that aren't supported by views on postgres (only base tables and mat views)

Changes

• Use a naive probabilistic sampling method instead - we achieve the same result, but its a bit more intensive on postgres

[greptile-apps]

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[greptile-apps]

logic: passing None for table_type could cause issues if add_sampling=True is added later - view queries would incorrectly use TABLESAMPLE and fail

Suggested change

	None,
	table.type,

Prompt To Fix With AI

This is a comment left during a code review.
Path: posthog/temporal/data_imports/sources/postgres/postgres.py
Line: 729:729

Comment:
**logic:** passing `None` for `table_type` could cause issues if `add_sampling=True` is added later - view queries would incorrectly use `TABLESAMPLE` and fail

```suggestion
                        table.type,
```

How can I resolve this? If you propose a fix, please make it concise.