[REF-2636]Improve Error message for unsupported event trigger

[ElijahAhianyo]

All Submissions:

• Have you followed the guidelines stated in CONTRIBUTING.md file?
• Have you checked to ensure there aren't any other open Pull Requests for the desired changed?

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

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• Have you linted your code locally prior to submission?

Changes To Core Features:

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• Have you written new tests for your core changes, as applicable?
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After these steps, you're ready to open a pull request.

a. Give a descriptive title to your PR.

b. Describe your changes.

c. Put `closes #XXXX` in your comment to auto-close the issue that your PR fixes (if such).

[linear]

REF-2636 Check Event Trigger Names

[masenf]

The link needs a trailing slash to pass CI

[picklelo]

awesome