Add container.FilterSlice function (#30339)

Many places have the following logic:
```go
func (jobs ActionJobList) GetRunIDs() []int64 {
	ids := make(container.Set[int64], len(jobs))
	for _, j := range jobs {
		if j.RunID == 0 {
			continue
		}
		ids.Add(j.RunID)
	}
	return ids.Values()
}
```

this introduces a `container.FilterMapUnique` function, which reduces
the code above to:
```go
func (jobs ActionJobList) GetRunIDs() []int64 {
	return container.FilterMapUnique(jobs, func(j *ActionRunJob) (int64, bool) {
		return j.RunID, j.RunID != 0
	})
}
```

models/actions/task_list.go

@@ -16,14 +16,9 @@ import (
 type TaskList []*ActionTask
 
 func (tasks TaskList) GetJobIDs() []int64 {
-	ids := make(container.Set[int64], len(tasks))
-	for _, t := range tasks {
-		if t.JobID == 0 {
-			continue
-		}
-		ids.Add(t.JobID)
-	}
-	return ids.Values()
+	return container.FilterSlice(tasks, func(t *ActionTask) (int64, bool) {
+		return t.JobID, t.JobID != 0
+	})
 }
 
 func (tasks TaskList) LoadJobs(ctx context.Context) error {