feat: Improve policy rule deletion process in PolicyServiceImpl

                .getPolicyRuleBasic()

                .setPolicyRuleState(REMOVED_POLICYRULE_STATE);

        // Delete from DB first, then remove from in-memory maps.

        // No setPolicyRule call — that would re-persist the row we're trying to delete.

        contextService

                .setPolicyRule(policyRule)

                .onFailure()

                .transform(failure -> new ExternalServiceFailureException(failure.getMessage()))

                .removePolicyRule(policyRuleId)

                .subscribe()

                .with(

                        tmp ->

                                LOGGER.infof(

                                        "Delete Policy with ID: " + VALID_MESSAGE, policyRuleBasic.getPolicyRuleId()));

        contextService.removePolicyRule(policyRuleId).subscribe().with(x -> {});

                        x -> LOGGER.infof(

                                "Deleted Policy with ID %s from context", policyRuleBasic.getPolicyRuleId()),

                        failure -> LOGGER.errorf(

                                "Failed to delete Policy with ID %s: %s",

                                policyRuleBasic.getPolicyRuleId(), failure.getMessage()));

        return new PolicyRuleState(

                PolicyRuleStateEnum.POLICY_REMOVED, REMOVED_POLICYRULE_STATE.getPolicyRuleStateMessage());