CLOUDP-70014: mongocli iam projects user(s) delete|rm

[andreaangiolillo]

Proposed changes

Jira ticket: CLOUDP-70014

Checklist

• I have signed the MongoDB CLA
• I have added tests that prove my fix is effective or that my feature works
• I have added any necessary documentation (if appropriate)
• I have run make fmt and formatted my code

Further comments

Atlas

./bin/mongocli iam projects users delete 5f4e89f73a9f5c0c8872ca8f
? Are you sure you want to delete: 5f4e89f73a9f5c0c8872ca8f Yes
User '5f4e89f73a9f5c0c8872ca8f' deleted from the project'

OM

./bin/mongocli iam projects users delete 5f4e2554df148d7efcdb4639 -P ops
? Are you sure you want to delete: 5f4e2554df148d7efcdb4639 Yes
User '5f4e2554df148d7efcdb4639' deleted from the project'

[gssbzn]

LGTM