Node: jest, add modulePathIgnorePatters option

[jmillan]

Indicate Jest not to look in worker/ nor rust/ for node modules.

Since flatbuffers is a npm module and also a subproject in worker folder, jest was complaining that there were two different modules for flatbuffers

[jmillan]

Is there include option? I'd prefer include option instead of exclude such that random things don't get included accidentally in the future.

Unfortunately there is not https://jestjs.io/docs/configuration

[ibc]

Let's merge?