[ISSUE 565] Implement Timeout Configuration for DAG Tasks

[Kiyo510]

Fixes: #565

Modified to allow timeouts to be set for DAG task execution.

• As outlined in issue Implement Timeout Configuration for DAG Tasks #565, when a timeout occurs, all steps are set to cancel status and the entire DAG is set to error status (failed).
  

• Output to the log to indicate that a step has been canceled.

time=2024-08-11T14:41:08.210+09:00 level=INFO msg="Workflow execution initiated" workflow=test2 requestID=0553ba38-1861-4a35-a0c5-5a9196e6f1ca logFile=/Users/kiyofumi.sano/.dagu/logs/start_test2.20240811.14:41:08.210.0553ba38.log
time=2024-08-11T14:41:08.213+09:00 level=INFO msg="Step execution started" step=step1
time=2024-08-11T14:41:08.214+09:00 level=INFO msg="Step execution started" step=step4
time=2024-08-11T14:41:08.214+09:00 level=INFO msg="Step execution started" step=step5
time=2024-08-11T14:41:09.231+09:00 level=INFO msg="Step execution finished" step=step1 status=finished
time=2024-08-11T14:41:09.324+09:00 level=INFO msg="Step execution started" step=step2
time=2024-08-11T14:41:09.324+09:00 level=INFO msg="Step execution started" step=step6
time=2024-08-11T14:41:10.215+09:00 level=INFO msg="Step execution deadline exceeded" step=step4 error="signal: killed"
time=2024-08-11T14:41:10.215+09:00 level=INFO msg="Step execution deadline exceeded" step=step6 error="signal: killed"
time=2024-08-11T14:41:10.215+09:00 level=INFO msg="Step execution deadline exceeded" step=step2 error="signal: killed"
time=2024-08-11T14:41:10.215+09:00 level=INFO msg="Step execution deadline exceeded" step=step5 error="signal: killed"
time=2024-08-11T14:41:10.216+09:00 level=INFO msg="Step execution finished" step=step4 status=canceled
time=2024-08-11T14:41:10.220+09:00 level=INFO msg="Step execution finished" step=step6 status=canceled
time=2024-08-11T14:41:10.224+09:00 level=INFO msg="Step execution finished" step=step2 status=canceled
time=2024-08-11T14:41:10.227+09:00 level=INFO msg="Step execution finished" step=step5 status=canceled
time=2024-08-11T14:41:10.334+09:00 level=INFO msg="Workflow execution finished" status=failed

Summary ->
+--------------------------------------+-------+---------------------------+---------------------------+--------+--------+----------------+
| REQUESTID                            | NAME  | STARTED AT                | FINISHED AT               | STATUS | PARAMS | ERROR          |
+--------------------------------------+-------+---------------------------+---------------------------+--------+--------+----------------+
| 0553ba38-1861-4a35-a0c5-5a9196e6f1ca | test2 | 2024-08-11T14:41:08+09:00 | 2024-08-11T14:41:10+09:00 | failed |        | signal: killed |
+--------------------------------------+-------+---------------------------+---------------------------+--------+--------+----------------+
Details ->
+---+-------+---------------------------+---------------------------+----------+----------+----------------+
| # | STEP  | STARTED AT                | FINISHED AT               | STATUS   | COMMAND  | ERROR          |
+---+-------+---------------------------+---------------------------+----------+----------+----------------+
| 1 | step1 | 2024-08-11T14:41:08+09:00 | 2024-08-11T14:41:09+09:00 | finished | sleep 1  |                |
| 2 | step2 | 2024-08-11T14:41:09+09:00 | 2024-08-11T14:41:10+09:00 | canceled | sleep 10 | signal: killed |
| 3 | step3 | -                         | -                         | canceled | sleep5   |                |
| 4 | step4 | 2024-08-11T14:41:08+09:00 | 2024-08-11T14:41:10+09:00 | canceled | sleep 4  | signal: killed |
| 5 | step5 | 2024-08-11T14:41:08+09:00 | 2024-08-11T14:41:10+09:00 | canceled | sleep 5  | signal: killed |
| 6 | step6 | 2024-08-11T14:41:09+09:00 | 2024-08-11T14:41:10+09:00 | canceled | sleep 1  | signal: killed |
+---+-------+---------------------------+---------------------------+----------+----------+----------------+time=2024-08-11T14:41:10.343+09:00 level=ERROR msg="Workflow execution failed" error="signal: killed" workflow=test2 requestID=0553ba38-1861-4a35-a0c5-5a9196e6f1ca

[codecov]

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All modified and coverable lines are covered by tests ✅

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Additional details and impacted files

@@           Coverage Diff           @@
##             main     #660   +/-   ##
=======================================
  Coverage        ?   66.37%           
=======================================
  Files           ?       53           
  Lines           ?     4173           
  Branches        ?        0           
=======================================
  Hits            ?     2770           
  Misses          ?     1183           
  Partials        ?      220           

Files	Coverage Δ
internal/agent/agent.go	74.40% <100.00%> (ø)
internal/dag/builder.go	78.52% <100.00%> (ø)
internal/dag/dag.go	76.59% <ø> (ø)
internal/dag/scheduler/scheduler.go	88.13% <100.00%> (ø)

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[yohamta]

✨✨✨LGTM✨✨🚀, thank you very much for the amazing work!