[FEAT] Update offline schema to not fail on unused arguments (such as watch)

[tstackhouse]

Is your feature request related to a problem? Please describe.
When attempting to create an e2e project to test an api built with nx-serverless:offline, it fails with a schema validation error because the watch option is passed by the cypress builder, but it is not part of the schema for serverless:offline and additionalProperties is set to false.

Describe the solution you'd like
To the schema for nx-serverlss:offline, either watch is added as e.g. an enum boolean that is always true or additionalProperties is set to true so that unused arguments are simply ignored rather than causing a hard fail.

Describe alternatives you've considered
The only real alternative would be to run 2 separate processes, starting the api manually, then having a cypress instance configured to not run a builder at all.

Check which provider is affected:
[x] AWS
[] Azure
[] Google Cloud Platform

Check which framework is affected:
[] Angular
[] Nodejs
[x] Serverless
[] Lambda
[] Infrastructure as a code

Additional context
I made this exact change in my node_modules and everything ran as expected.

[tstackhouse]

Along the same lines, it looks like offline doesn't return a baseUrl requiring one to bet set in cypress.json.

[tstackhouse]

Fixed by #73.