It's not really necessary if the information about if the lambda was a
trailing lambda can be directly saved in FirAnonymousFunctionExpression.
Removing the FIR node uncovered a couple of bugs
(UNINITIALIZED_ENUM_ENTRY, ERROR_IN_CONTRACT_DESCRIPTION) that were
caused by assuming that a lambda is always a trailing lambda.
#KT-66124
IllegalArgumentException: class
org.jetbrains.kotlin.psi.KtLambdaArgument is not a subtype of class
org.jetbrains.kotlin.psi.KtExpression for factory
TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM
was reported when TYPECHECKER_HAS_RUN_INTO_RECURSIVE_PROBLEM was
reported on a FirLambdaArgumentExpression, report it on its
`expression` instead.
#KT-60380 Fixed