feature/single-organization-limit

[chungyau97]

Description

Enforces a single organization limit during registration for both Enterprise and Open Source platforms.

Test steps

Open Source:

1. First time Registration
2. Log out
3. Second time registration via UI will receive error message "You can only have one organization"
4. Second time registration via API will receive error message "You can only have one organization"

Enterprise:

1. First time Registration
2. Log out
3. Second time registration via UI will receive error message "You can only have one organization"
4. Second time registration via API will receive error message "You can only have one organization"
5. Login with first time register credential
6. Invite user
7. Register invite user
8. Invite user able to login

Cloud:

1. Register first user
2. First user able to login
3. Log out
4. Register second user
5. Second user able to login

Result

Open Source:

Second time registration via UI will receive error message "You can only have one organization"	Second time registration via API will receive error message "You can only have one organization"

Enterprise:

Second time registration via UI will receive error message "You can only have one organization"	Second time registration via API will receive error message "You can only have one organization"	Register invite user	Invite user able to login

Cloud:

Register first user	First user able to login	Register second user	Second user able to login

[HenryHengZJ]

Malicious user cannot register again if the organization has already existed: