[Backport 6.8] Fix iterate-from-1 bug in smart realm order #49617
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The AuthenticationService has a feature to "smart order" the realm chain so that whicherver realm was the last one to successfully authenticate a given user will be tried first when that user tries to authenticate again. There was a bug where the building of this realm order would incorrectly drop the first realm from the default chain unless that realm was the "last successful" realm. In most cases this didn't cause problems because the first realm is the reserved realm and so it is unusual for a user that authenticated against a different realm to later need to authenticate against the resevered realm. This commit fixes that bug and adds relevant asserts and tests. Backport of: elastic#49473
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The AuthenticationService has a feature to "smart order" the realm
chain so that whicherver realm was the last one to successfully
authenticate a given user will be tried first when that user tries to
authenticate again.
There was a bug where the building of this realm order would
incorrectly drop the first realm from the default chain unless that
realm was the "last successful" realm.
In most cases this didn't cause problems because the first realm is
the reserved realm and so it is unusual for a user that authenticated
against a different realm to later need to authenticate against the
resevered realm.
This commit fixes that bug and adds relevant asserts and tests.
Backport of: #49473