convert warn_or_error to use specific event

[emmyoop]

resolves #308

Description

Convert to use new event

Still need to test locally that warnings are emitted as expected since this event is usually not called directly

Checklist

• I have read the contributing guide and understand what's expected of me
• I have signed the CLA
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• I have opened an issue to add/update docs, or docs changes are not required/relevant for this PR
• I have run changie new to create a changelog entry

[github-actions]

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[dave-connors-3]

just bumped into this issue locally! is this slated to be merged today?

[emmyoop]

@dave-connors-3 that's the plan. We just need to verify the log message gets generated as expected then we should be able to merge it in.

[McKnight-42]

ran locally after digging into testing and was able to prove proper output

[emmyoop]

@leahwicz - can you override these failing tests to merge this in? This is blocking the fix that will resolve the test errors: #307

This change is only for 1.4 but the other PR will need to be backported - that's why they are separate.

[emmyoop]

Also wanted to note this fix is a bit of a stopgap until dbt-labs/dbt-core#6165 can be done. Notes there are this as well.

[leahwicz]

Done!