Remove few more ILLink warnings in System.Data.Common (#55335)

Author: krwq

src/libraries/System.Data.Common/src/ILLink/ILLink.Suppressions.xml

@@ -1,18 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <linker>
   <assembly fullname="System.Data.Common, PublicKeyToken=b03f5f7f11d50a3a">
-    <attribute fullname="System.Diagnostics.CodeAnalysis.UnconditionalSuppressMessageAttribute">
-      <argument>ILLink</argument>
-      <argument>IL2026</argument>
-      <property name="Scope">member</property>
-      <property name="Target">M:System.Data.ColumnTypeConverter.ConvertTo(System.ComponentModel.ITypeDescriptorContext,System.Globalization.CultureInfo,System.Object,System.Type)</property>
-    </attribute>
-    <attribute fullname="System.Diagnostics.CodeAnalysis.UnconditionalSuppressMessageAttribute">
-      <argument>ILLink</argument>
-      <argument>IL2060</argument>
-      <property name="Scope">member</property>
-      <property name="Target">M:System.Data.DataRowExtensions.UnboxT`1.Create</property>
-    </attribute>
     <attribute fullname="System.Diagnostics.CodeAnalysis.UnconditionalSuppressMessageAttribute">
       <argument>ILLink</argument>
       <argument>IL2026</argument>
@@ -61,12 +49,6 @@
       <property name="Scope">member</property>
       <property name="Target">M:System.Data.DataTable.WriteXmlCore(System.Xml.XmlWriter)</property>
     </attribute>
-    <attribute fullname="System.Diagnostics.CodeAnalysis.UnconditionalSuppressMessageAttribute">
-      <argument>ILLink</argument>
-      <argument>IL2026</argument>
-      <property name="Scope">member</property>
-      <property name="Target">M:System.Data.DataView.SetRowFilter(System.String)</property>
-    </attribute>
     <attribute fullname="System.Diagnostics.CodeAnalysis.UnconditionalSuppressMessageAttribute">
       <argument>ILLink</argument>
       <argument>IL2026</argument>

src/libraries/System.Data.Common/src/System/Data/ColumnTypeConverter.cs

@@ -3,6 +3,7 @@
 
 using System.ComponentModel;
 using System.ComponentModel.Design.Serialization;
+using System.Diagnostics.CodeAnalysis;
 using System.Globalization;
 using System.Data.SqlTypes;
 using System.Reflection;
@@ -65,6 +66,8 @@ public override bool CanConvertTo(ITypeDescriptorContext? context, Type? destina
         /// <summary>
         /// Converts the given value object to the specified destination type.
         /// </summary>
+        [UnconditionalSuppressMessage("ReflectionAnalysis", "IL2026:RequiresUnreferencedCode",
+            Justification = "InstanceDescriptor calls GetType(string) on AssemblyQualifiedName of instance of type we already have in here.")]
         public override object? ConvertTo(ITypeDescriptorContext? context, CultureInfo? culture, object? value, Type destinationType)
         {
             if (destinationType == null)