[FIR] Remove FirLambdaArgumentExpression

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

analysis/low-level-api-fir/testData/getOrBuildFir/calls/qualifiedCallInsideSuperCallScript.txt

@@ -30,7 +30,7 @@ FILE: [ResolvedTo(IMPORTS)] qualifiedCallInsideSuperCallScript.kts
 
         public final [ResolvedTo(BODY_RESOLVE)] object C : R|A| {
             private [ResolvedTo(BODY_RESOLVE)] [ContainingClassKey=C] constructor(): R|C| {
-                super<R|A|>([ResolvedTo(RAW_FIR)] fun R|A|.<anonymous>(): R|kotlin/Unit| <inline=Unknown>  {
+                super<R|A|>([ResolvedTo(RAW_FIR)] [MatchingParameterFunctionTypeKey=@ExtensionFunctionType kotlin/Function1<A, kotlin/Unit>] fun R|A|.<anonymous>(): R|kotlin/Unit| <inline=Unknown>  {
                     local final [ResolvedTo(RAW_FIR)] fun foo(): R|kotlin/String| {
                         ^foo Q|B|.R|/A.prop|.R|kotlin/String.toString|()
                     }