CI Improvement

We want more granular CI tasks for our eslint tests, type tests, unit tests, api-extractor tests. We should break them each out into their own task on EVG, but all inside the run-checks variant.

Investigate launching each of these tasks directly from evergreen instead of using a script per task. Something like: subprocess.exec, binary: npm, args: 'run', 'check:eslint'. Alternatively, consider using gh-actions for these tasks.