Abin Simon cd7c63ba6f
Fix slack notification for nightly tests (#3504)
Since nightly tests are run on a schedule and not triggered from a commit or PR, we do not have `github.event.pull_request.html_url` or `github.event.head_commit.url` available.

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#### Does this PR need a docs update or release note?

- [ ]  Yes, it's included
- [ ] 🕐 Yes, but in a later PR
- [x]  No

#### Type of change

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- [ ] 🌻 Feature
- [ ] 🐛 Bugfix
- [ ] 🗺️ Documentation
- [ ] 🤖 Supportability/Tests
- [x] 💻 CI/Deployment
- [ ] 🧹 Tech Debt/Cleanup

#### Issue(s)

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* #<issue>

#### Test Plan

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- [x] 💪 Manual
- [ ]  Unit test
- [ ] 💚 E2E
2023-05-26 01:24:30 +00:00
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