'make protoc' now utilizes docker workflow by default.

[cody-littley]

Why are these changes needed?

This change makes make protoc use the dockerized workflow by default. make protoc-local can be used for the legacy build workflow that does not utilize docker.

Checks

• [x] I've made sure the lint is passing in this PR.
• [x] I've made sure the tests are passing. Note that there might be a few flaky tests, in that case, please comment that they are not relevant.
• Testing Strategy
  • [x] Hand tests (CI use of this workflow comes in following PR)
  • [ ] Unit tests
  • [ ] Integration tests
  • [ ] This PR is not tested :(