TrigP1Test: fix magFieldToggle ART test and CA migration

Frank Winklmeierrequested to merge
fwinkl/athena:magfield into 23.0

Need to disable the magnet auto-configuration for this test after !61684 (merged) enabled it by default. Also migrate the test to CA.

Closes ATR-27647.

Edited by Frank Winklmeier

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