cli: validation rule for principal names was extended to support periods #6878
Description
PR: cockroachdb/cockroach#45575
From release notes:
The validation rule for principal names was extended to support periods and thus allow domain name-like principals. For reference, the validation rule is currently the regular expression
^[\p{Ll}0-9_][---\p{Ll}0-9_.]+$, and limited to a size of 63 UTF-8 bytes (larger usernames are rejected with an error); for comparison, PostgreSQL allows many more characters and truncates at 63 characters silently. [#45575][#45575] {% comment %}doc{% endcomment %}Usernames can now contain periods, for compatibility with certificate managers that require domain names to be used as usernames. [#45575][#45575] {% comment %}doc{% endcomment %}