[FIR IDE] Small refactoring of `KtClassMember`

- optimize imports
- use @NlsSafe to avoid warning
- remove checking `KtFunctionSymbol is KtConstructorSymbol` (it is always false)

GitOrigin-RevId: cca3fe99c5a5a129ca0e836254333e914ad27d05

plugins/kotlin/fir/src/org/jetbrains/kotlin/idea/core/overrideImplement/KtClassMember.kt

@@ -6,17 +6,17 @@ import com.intellij.codeInsight.generation.ClassMember
 import com.intellij.codeInsight.generation.MemberChooserObject
 import com.intellij.codeInsight.generation.MemberChooserObjectBase
 import com.intellij.openapi.project.Project
+import com.intellij.openapi.util.NlsSafe
 import com.intellij.psi.PsiDocCommentOwner
-import org.jetbrains.kotlin.idea.core.TemplateKind
-import org.jetbrains.kotlin.idea.core.getFunctionBodyTextFromTemplate
 import org.jetbrains.kotlin.analysis.api.KtAnalysisSession
 import org.jetbrains.kotlin.analysis.api.components.KtDeclarationRendererOptions
 import org.jetbrains.kotlin.analysis.api.components.RendererModifier
 import org.jetbrains.kotlin.analysis.api.symbols.KtCallableSymbol
-import org.jetbrains.kotlin.analysis.api.symbols.KtConstructorSymbol
 import org.jetbrains.kotlin.analysis.api.symbols.KtFunctionSymbol
 import org.jetbrains.kotlin.analysis.api.symbols.KtPropertySymbol
 import org.jetbrains.kotlin.analysis.api.symbols.markers.KtNamedSymbol
+import org.jetbrains.kotlin.idea.core.TemplateKind
+import org.jetbrains.kotlin.idea.core.getFunctionBodyTextFromTemplate
 import org.jetbrains.kotlin.idea.j2k.IdeaDocCommentConverter
 import org.jetbrains.kotlin.idea.kdoc.KDocElementFactory
 import org.jetbrains.kotlin.lexer.KtTokens
@@ -32,7 +32,7 @@ import javax.swing.Icon
 internal data class KtClassMemberInfo(
     // TODO: use a `KtSymbolPointer` instead to avoid storing `KtSymbol` in an object after KT-46249 is fixed.
     val symbol: KtCallableSymbol,
-    val memberText: String,
+    @NlsSafe val memberText: String,
     val memberIcon: Icon?,
     val containingSymbolText: String?,
     val containingSymbolIcon: Icon?,
@@ -157,16 +157,8 @@ private fun KtAnalysisSession.generateFunction(
 
     val factory = KtPsiFactory(project)
     val functionText = symbol.render(renderOptions.copy(forceRenderingOverrideModifier = isOverride)) + body
-    return when (symbol) {
-        is KtConstructorSymbol -> {
-            if (symbol.isPrimary) {
-                factory.createPrimaryConstructor(functionText)
-            } else {
-                factory.createSecondaryConstructor(functionText)
-            }
-        }
-        else -> factory.createFunction(functionText)
-    }
+
+    return factory.createFunction(functionText)
 }
 
 private fun KtAnalysisSession.generateProperty(