Invite acceptance could fail for cloud organizations with many projects
because the whole flow ran inside a single transaction and did too much
work before it completed. In larger orgs, that pushed the transaction
past its timeout and blocked the invite from being accepted.
This PR moves the expensive parts of invite acceptance out of the
transaction, excludes deleted projects from environment setup, fixes
error handling on /invites, and adds regression coverage for the failure
cases.
Katia Bulatova
cd9d20cc99