feat(cli): allow showing schedules for multiple workspaces (#10596)

* coder list: adds information about next start / stop to available columns (not default)
* coder schedule: show now essentially coder list with a different set of columns
* Updates cli schedule unit tests to use new dbfake

Co-authored-by: Mathias Fredriksson <mafredri@gmail.com>

coderd/schedule/cron/cron.go

@@ -115,7 +115,7 @@ type Schedule struct {
 	cronStr string
 }
 
-// String serializes the schedule to its original human-friendly format.
+// String serializes the schedule to its original format.
 // The leading CRON_TZ is maintained.
 func (s Schedule) String() string {
 	var sb strings.Builder
@@ -126,6 +126,19 @@ func (s Schedule) String() string {
 	return sb.String()
 }
 
+// Humanize returns a slightly more human-friendly representation of the
+// schedule.
+func (s Schedule) Humanize() string {
+	var sb strings.Builder
+	_, _ = sb.WriteString(s.Time())
+	_, _ = sb.WriteString(" ")
+	_, _ = sb.WriteString(s.DaysOfWeek())
+	_, _ = sb.WriteString(" (")
+	_, _ = sb.WriteString(s.Location().String())
+	_, _ = sb.WriteString(")")
+	return sb.String()
+}
+
 // Location returns the IANA location for the schedule.
 func (s Schedule) Location() *time.Location {
 	return s.sched.Location