add triage-labels workflow

[dbeatty10]

resolves #502

Group of PRs

• add triage-labels workflow dbt-snowflake#519
• add triage-labels workflow dbt-bigquery#601
• add triage-labels workflow #678
• add triage-labels workflow dbt-redshift#366

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
• 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 label:skip_changelog

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the dbt-spark contributing guide.

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the dbt-spark contributing guide.