Update to latest .Net SDK 7.0 (#1760)

* Bump to SDK 7.0 and related updates

* More net 7 updates

* Install SDK 2.0 for ESRP

* Fix typo

* Address comment and update integration test script

* Disable new warnings from SDK update

src/Microsoft.SqlTools.Credentials/Credentials/Linux/Interop.Errors.cs

@@ -22,7 +22,7 @@ namespace Microsoft.SqlTools.Credentials
             // which obtains the raw errno that varies between unixes. The strong typing as an enum is meant to
             // prevent confusing the two. Casting to or from int is suspect. Use GetLastErrorInfo() if you need to
             // correlate these to the underlying platform values or obtain the corresponding error message.
-            // 
+            //
 
             SUCCESS          = 0,
 
@@ -183,7 +183,7 @@ namespace Microsoft.SqlTools.Credentials
                     // so here in the future if necessary.
                     message = buffer;
                 }
-                
+
                 string returnMsg = Marshal.PtrToStringAnsi(message);
                 return returnMsg;
                 }

src/Microsoft.SqlTools.Credentials/Credentials/Linux/Interop.Sys.cs

@@ -17,7 +17,7 @@ namespace Microsoft.SqlTools.Credentials
         {
             [DllImport(Libraries.SystemNative, EntryPoint = "SystemNative_ChMod", SetLastError = true)]
             internal static extern int ChMod(string path, int mode);
-            
+
             internal struct Passwd
             {
                 internal IntPtr Name;           // char*