[AA] AbstractSingleSymbolByPsi: search elements by caret instead of expression

^KT-54311

analysis/analysis-api/testData/symbols/singleSymbolByPsi/errors/anonympuseObjectInInvalidPosition.kt

@@ -1,6 +1,6 @@
-private val _commonSettingsLazy: A = null = <expr>object : A<Int> {
+private val _commonSettingsLazy: A = null = ob<caret>ject : A<Int> {
     override fun x() {}
-}</expr>
+}
 
 interface A<T> {
     fun x()

analysis/analysis-api/testData/symbols/singleSymbolByPsi/errors/objectWithTypeArgsAsExpression.kt

@@ -1,3 +1,3 @@
-private val commonSettingsLazy = <expr>object A<LanguageVersionSettings> {
+private val commonSettingsLazy = o<caret>bject A<LanguageVersionSettings> {
    println(x)
-}</expr>
+}