Merged PR 4530: first comment time added

# Description

First comment time added

# Checklist

- [x] The edited models and dependants run properly with production data.
- [x] The edited models are sufficiently documented.
- [x] The edited models contain PK tests, and I've ran and passed them.
- [ ] I have checked for DRY opportunities with other models and docs.
- [ ] I've picked the right materialization for the affected models.

# Other

- [ ] Check if a full-refresh is required after this PR is merged.

first comment time added

Related work items: #27812

models/intermediate/resolutions/int_resolutions__incidents.sql

@@ -159,6 +159,14 @@ select
     lt.first_comment_at_utc,
     lt.last_comment_at_utc,
     lt.comment_count,
+    case
+        when lt.first_comment_at_utc is not null
+        then
+            (
+                extract(epoch from (lt.first_comment_at_utc - i.created_at_utc)) / 3600
+            )::decimal(19, 4)
+        else null
+    end as time_to_first_comment_in_hours,
     lt.first_status_at_utc,
     lt.last_status_at_utc,
     case