for #24471
This PR adds missing support for updating a team's failing policy
webhook via GitOps:
* If `team_settings.webhook_settings.failing_policies_webhook` is not
set, the webhook will be disabled and all settings cleared.
* If `team_settings.webhook_settings.failing_policies_webhook` is set,
the webhook will be configured according to the specified settings.
A new test has been added to verify this functionality, and I tested it
locally using the `fleetctl gitops` command.
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Co-authored-by: Dante Catalfamo <43040593+dantecatalfamo@users.noreply.github.com>
