Avoid creating pseudo variable for expected result in parametrized test

[EgorkaKulikov]

Description

Code generation for parametrized tests contains the following hack:

val pseudoExceptionVarName = when (codegenLanguage) {
      CodegenLanguage.JAVA -> "${expectedErrorVarName}.isInstance(${e.name.decapitalize()})"
      CodegenLanguage.KOTLIN -> "${expectedErrorVarName}!!.isInstance(${e.name.decapitalize()})"
  }

Expected behavior

All variables are created with newVar or declareVariable methods.