[FEATURE] Slack notification 변경

[ssaru]

🚀 Feature

1. Template repo
     - GitHub Action fail시 #github-action-noti에 notification
     - Mention시 #github-mention에 notificaction

2. Individual repo
     - GitHub Action fail시 개인 DM / Maintainer DM(황동현/김보섭)
     - Mention시 #github-mention에 notification

3. etc

• pytest error message format

XXX » feature/CONV-XXX-XXXX #15 (See commit)
UNSTABLE after 4 min 32 sec (Open Jenkins)
Test result:
    Total: 167, Failed: 4, Skipped: 13
Failed tests:
    tests/e2e/test_e2e.py:94 test_scenario_00 after 6.992 sec

• Pytest GitHub Action format에서 message, action, ref, eventName 제거

Motivation

• Slack notification이 너무 많음

Pitch

• 리서치 필요

Additional context