[tooling] Do not fail silently in notify action

[mjwolf]

1. What does this PR do?

In the notify github action, do not fail silently, by failing the entire action when the webhook call fails.

2. Which ECS fields are affected/introduced?

N/A

3. Why is this change necessary?

Closes #2565

4. Have you added/updated documentation?

N/A

5. Have you built ECS and committed any newly generated files?

NO

6. Have you run the ECS validation tests locally?

NO

7. Anything else for the reviewers?

---

Commit Message

In the notify action, when the curl webhook call fails, also fail the entire action, so that webhook will not fail silently.

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