Add automated test for "Authentication security module disable account"

The manual test is here: Authentication security module disable account

Existing automated coverage

• DisableAccountFailureStrategyTest#resetAuthenticationFailureCounterWhenAccountIsActivated: unit only: the failure counter is reset when the account is re-activated
• DefaultAuthenticationFailureManagerTest#authenticationFailureLimitReached: unit only: strategies are notified when the max attempts are reached
• UserProfileIT#toggleEnableDisable: admin disables then enables an account from the user profile page (not linked to the failure strategy)

Missing automated coverage

• As admin, in Administer Wiki > Users & Rights > Authentication select Failure Strategy "Disable account", set Maximum number of authorized attempts to 4 and Save
• Create user U1, log out, fail to log in as U1 4 times
• Assert the error "This account has been disabled. Please ask the administrator to enable it back." is shown and the correct password is refused
• As admin, enable U1 from its profile page (ProfileUserProfilePage#clickEnable)
• Log out and assert U1 can log in with the correct password

Suggested location: xwiki-platform-core/xwiki-platform-flamingo/xwiki-platform-flamingo-skin/xwiki-platform-flamingo-skin-test/xwiki-platform-flamingo-skin-test-docker/src/test/it/org/xwiki/flamingo/test/docker/LoginProtectionIT.java

Found by comparing the XWiki 18.4.4 manual test runs against the automated tests on master (a0055f10a1a).