Replace the PostHog driver unit test's local HTTP server with the same\nrecorder-backed test style used by the other access-review drivers.\n\nAdd a committed PostHog cassette under testdata so replay mode works\nwithout network access while keeping fixture coverage for role, MFA,\nand timestamp mapping expectations.
Signed-off-by: Cursor Agent <cursoragent@cursor.com>
Co-authored-by: Bryan FRIMIN <bryan@frimin.fr>
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