Add compatibility for SCMTriggerItem-related changes in 1.568

f43a450c addendum: during migration, if nothing else is being fingerprinted besides archived artifacts, then there is no reason to keep the separate fingerprint publisher at all.

Some loggers may show the thread name anyway, but /log/* in the UI at least does not.
And recent versions of Jenkins are being improved to capture lots of context in the thread name;
an unreleased improvement in Stapler includes the Jelly views being rendered.

For icons not defined in the IconSet

prevent build index page to redirect anonymous user to login just because some artifact share fingerprints with another job

For regular test failures this is normally just annoying noise.

@Nonnull annotation.

[FIXED JENKINS-23970] CLI authentication with username/password try to read my .ssh/id_rsa and prompts for key password