[CT-3494] Deprecate the `core-triage` action

[dbeatty10]

Housekeeping

• I am a maintainer of actions

Short description

This action might not be in use any longer. If so, we can deprecate it as low-hanging tech debt.

One benefit is reducing noise in cases where the action doesn't run successfully.

Acceptance criteria

1. Confirm will all relevant stakeholders (PMs, DX, EMs for Core+Adapters) that this action is no longer in use
2. Remove the files added within #27:
   • remove .github/workflows/core-triage.yml
   • remove scripts directory:
     • scripts/core-triage/graphql_queries.py
     • scripts/core-triage/project.py
     • requirements.txt
     • README.md

Impact to Other Teams

It is possible that someone among PMs, DX, EMs for Core+Adapters is using this view within a larger GitHub project board, so we'd just need to check first prior to merge.

Context

https://dbt-labs.slack.com/archives/C044WU55X7Y/p1702489398282579

[emmyoop]

This has been disabled for a while so we can just delete it at this point.

[dbeatty10]

@emmyoop here you go: #164