[CI] Add JSI Codegen to CI

Summary:
Context: https://linear.app/comm/issue/ENG-2382/make-codegen-jsi-part-of-phabricator-ci

Add JSI Codegen to CI to
A. Make sure that it runs successfully (exit code 0)
B. Make sure that none of the generated files change (git diff --exit-code)

Test Plan: We'll see what happens with CI

Reviewers: tomek, marcin, ginsu, rohan, adar, ashoat

Reviewed By: ashoat

Subscribers: ashoat

Differential Revision: https://phab.comm.dev/D5797