[Feature Request]: Support for Extended Durations in wait step in Grafana OnCall Provider

[Axel-sys-777]

Feature Request

Currently, the Grafana OnCall Terraform Provider supports duration values of 60, 300, 900, 1800, and 3600 seconds (up to 1 hour). This request is to extend the maximum allowable duration to support longer wait times, ideally up to 24 hours (86400 seconds).

Use Case: In many operational scenarios, particularly in incident management and escalation processes, it is often necessary to define wait steps that extend beyond the current 1-hour limit. Extending the duration support to 24 hours would provide greater flexibility and enable more comprehensive incident management workflows.

Proposed Solution: Modify the Grafana OnCall Terraform Provider to support duration values up to 86400 seconds (24 hours).

Thank you very much.