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Remove dead .crumb fallback in CrumbFilter
The fallback added in ed0ea631 (JENKINS-12875) discarded its return
value, so the legacy .crumb field name has never been accepted since
2014. The compatibility window it targeted is long expired; delete the
dead code instead of reviving it. Add a test pinning that a valid crumb
under the configured field name is accepted and the same crumb under
".crumb" is rejected.
Fixes #27431