Add an optional Project to the upsertClient mutation

[fermion]

If creating a new client

• create the client and project atomically
  • the project could fail to save, and block the client from being created
  • the UI will need to handle this case
• If updating a client, update any fields and create the new project
  • we should probably use upsertProject in most cases where the client already exists 👍🏻

[goinvo-actions-automation-bot]

This issue may be stale. Please remove the stale-issue label if this is still relevant.

[fermion]

We'll re-open this when we want to cross this bridge.

[fermion]

Re-opening as @HankC138 just mentioned needing this soon!

[goinvo-actions-automation-bot]

This issue may be stale. Please remove the stale-issue label if this is still relevant.