fix: yarn topological dev build

[yusinto]

CI failed because yarn workspaces foreach -pR --topological-dev --from '@launchdarkly/xxx' run build. This is because topological-dev instructs yarn to build all deps (prod & dev) prior to running build in the current workspace. Since mocks need types from common this fails.

This pr adds a build-types command to common which gets run prior to mocks build command to ensure common types exist for mocks to be built successfully.

[louis-launchdarkly]

@yusinto, the change looks fine to me. Do you expect the build to still have issues?

[kinyoklion]

I think that the name for build test mocks must have a problem?

Showing under cloudflare?

[kinyoklion]

Should build once it has a typedoc file. Currently all packages expect to build docs.

[yusinto]

Sorry this was incorrectly set as cloudflare @louis-launchdarkly . I have fixed this now.

[kinyoklion]

I had re-requested changes already, but it looks like my review was re-requested afterward.

[yusinto]

As requested @kinyoklion

[kinyoklion]

I really wish the CI was running for these PRs so I could be sure.

I added a rule that any branch that starts with feat/ will run all checks when PR'd against. When we have cumulative ones like this, we will probably want to leverage that.

As is, I will approve this PR, and then we will need to check that the docs steps are running correctly on the other.

My main apprehension is about the types. I think that it will always be a 'string' in this case and 'true' is what we want. But the builds will tell us for sure.