[FIX] stock: remove existing demo data on reinstall

Previous to this rev.:
    *Install stock w/ demo data
    *Uninstall stock
    *Reinstall stock

Result: Boom! Installation crashes.

Reason: The demo data installed with stock is not properly deleted after
the module is uninstalled, which causes issues/conflicts upon
reinstallation of the same demo data.

Solution: Remove any demo data of stock models upon installation if any
exist through a pre_init_hook, ideally this would be done by overriding
the unlink() of the affected models / setting some ondelete='cascade',
or even a uninstall_hook, however these solutions prove insufficient for
databases that are currently affected by the problem.

Fixes #22243

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