fix(build): ensure build fails when types building fails

[tkrugg]

Summary
At the moment failing build types are not being surfaced to circle ci. See for example this build, step Trigger a release if the latest commit is a release commit should have failed but it didn't.

This is because yarn built:types is run via shell.exec and the return code of 1 is ignored, instead of passed to calling process.

Per exec docs, it's the caller's reponsibility to read the exit code and exit or continue.

// Run external tool synchronously
if (shell.exec('git commit -am "Auto-commit"').code !== 0) {
  shell.echo('Error: Git commit failed');
  shell.exit(1);
}

This change would effectively make sure that scripts/release/build-experimental-typescript.js return code 1 if any of the exec inside do.

NB: exec is also called in other areas but in this case, it's not from shelljs but the one in shipjs-lib which reads and throws when code is 1.

[Haroenv]

is this the same but a simpler option?

[codesandbox-ci]

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