Remove WITH_NEW_INFERENCE directive from all tests

This directive anyway does not make test run twice with OI, and with NI
It only once run the test with specific settings (// LANGUAGE)
and ignores irrelevant (OI or NI tags)

compiler/tests-spec/testData/diagnostics/notLinked/contracts/analysis/common/neg/1.fir.kt

@@ -1,5 +1,4 @@
 // !USE_EXPERIMENTAL: kotlin.contracts.ExperimentalContracts
-// !WITH_NEW_INFERENCE
 
 // FILE: contracts.kt
 

compiler/tests-spec/testData/diagnostics/notLinked/contracts/analysis/common/neg/1.kt

@@ -1,5 +1,4 @@
 // !USE_EXPERIMENTAL: kotlin.contracts.ExperimentalContracts
-// !WITH_NEW_INFERENCE
 
 /*
  * KOTLIN DIAGNOSTICS NOT LINKED SPEC TEST (NEGATIVE)