[Peek]Peek and Monaco file encoding issues are solved with a encoding detector (#26955)

* [Peek] Peek and Monaco file encoding issues are solved with a encoding detector.

* [Peek] Monaco encoding parameter is moved to another function.

* [Peek] NOTICE.md update.

* [Peek] Spell Check update.

* UTF-Unknown is added to Nuget list in Notice.md

* System.Text.Encoding.CodePages is added to Nuget list in Notice.md

* [Peek] Unncessary mainfest files are deleted.

* [Peek ] Unncessary mainfest file are deleted.

* [Peek] Encoding null check is added.

* Update NOTICE.md

* Update NOTICE.md

* ci: Add signing to UtfUnknown

.pipelines/ESRPSigning_core.json

@@ -289,6 +289,7 @@
                 "ColorCode.Core.dll", 
                 "ColorCode.UWP.dll",
                 "UnitsNet.dll",
+                "UtfUnknown.dll",
                 "Wpf.Ui.dll"
             ],
             "SigningInfo": {