Require 2 CODEOWNER reviews for artifact changes

[emmyoop]

Problem

Let's ensure artifact and validation changes include 2 core reviews. GitHub doesn't allow this in a built in way so we'll use a required workflow.

Solution

Check number of reviews in a workflow
Require workflow to pass before PR can be merged

Checklist

• I have read the contributing guide and understand what's expected of me.
• I have run this code in development, and it appears to resolve the stated issue.
• This PR includes tests, or tests are not required or relevant for this PR.
• This PR has no interface changes (e.g., macros, CLI, logs, JSON artifacts, config files, adapter interface, etc.) or this PR has already received feedback and approval from Product or DX.
• This PR includes type annotations for new and modified functions.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.92%. Comparing base (c042370) to head (4313c32).

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #11256      +/-   ##
==========================================
+ Coverage   88.87%   88.92%   +0.04%     
==========================================
  Files         187      187              
  Lines       24072    24072              
==========================================
+ Hits        21395    21406      +11     
+ Misses       2677     2666      -11     

Flag	Coverage Δ
integration	86.30% <ø> (+0.11%)	⬆️
unit	62.44% <ø> (ø)

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
Unit Tests	62.44% <ø> (ø)
Integration Tests	86.30% <ø> (+0.11%)	⬆️