Drops tests/e2e/guardrails/test_presidio_guardrail_e2e.py and the
PresidioParamsBody it was the only caller of.
Both cases were red on most stage runs between 07-25 and 07-29: pre_call
failed 6 of 11 runs, post_call 6 of 11, with post_call reporting the raw
address reaching the caller while apply_to_output was set.
The cause was propagation, not masking. GuardrailsClient.register() posts
/guardrails and returns immediately with no readiness wait, unlike
ProxyClient._await_model_servable or GuardrailsClient._await_team, and the
data plane only picks a new guardrail up on its next periodic DB sync. Calls
issued before that sync pass the raw value through. #34833 has since made
both cases poll to the deadline, and on the current build each masks on the
first attempt, so the suite is expected to be green now; it is being removed
because it spends real provider money on every retry and because a pod
replaced mid-poll still reproduces the old failure.
The three guardrail.presidio.* rows stay in coverage_registry/guardrail.yaml
and go uncovered on purpose, so Presidio reads as a tier-P0 gap in Grafana
rather than dropping out of the denominator.