As a portal admin, I can configure a blacklist of email domains for account users

• Type: Story
• Status: Closed
• Priority: Minor
• Resolution: Completed
• Affects Version/s: None
• Fix Version/s: Master
• Component/s: User Management > Business Accounts
• Labels:
  • 7.3-ce-ga5
  • UandSM-jun20
  • fc_20_06
  • planned_for_7.3
• Epic Link: Account Email Domain
• Sprint: U&SM| S03 Sprint 24 |5.26-6.9, U&SM| S03 Sprint 25 | 6.9-23, U&SM| S03 Sprint 26 | 6.23-7.7, U&SM| S03 Sprint 27 | 7.7-7.21, U&SM| S03 Sprint 28 | 7.21-8.4
• Git Pull Request: https://github.com/brianchandotcom/liferay-portal/pull/91457

Acceptance Criteria
1. As a portal administrator, I can configure an instance-wide list of email domains that 2B account administrators cannot add/invite to their account. (for example: @gmail.com, @yahoo.com).
2. If consumer email addresses are disallowed, B2 account managers can still explicitly create account users with consumer email addresses and assign them to an account.