Poor UX when creating misconfigured cron trigger for serverless container

[MikailBag]

Control flow enters this code:

terraform-provider-yandex/yandex/resource_yandex_function_trigger.go

Line 747 in b2a8bff

if retrySettings != nil || dlqSettings != nil {

Now, if neither retry not DLQ is configured, provider enters else branch and tries to create function.
As a result, creation fails with error rule.timer.invoke_function.function_id: Field is required which gives no clue about real problem (i.e. missing dlq and retry policy).

[PeppaTheC]

Passed issue to the serverless team, they are investigating the problem.