Clean up ValidationExceptions.json by removing NDA entries

Removed NDA Keyword Validation entries from ValidationExceptions.json.

Author: josepmariapujol-unity

Packages/com.unity.inputsystem/ValidationExceptions.json

@@ -6,36 +6,6 @@
             "PackageVersion": "1.19.1",
             "__comments": "starting from 2022.3 ugui is not added to the project by default. We have some APIs that are conditional on ugui being present, so the API Validation thinks we are breaking API, but that is not the case."
         },
-        {
-          "ValidationTest": "NDA Keyword Validation",
-          "ExceptionMessage": "File 'Documentation~/Gamepad.md' contains keyword pattern '(?<!(BuildTarget|BuildTargetGroup|BuildSettings|AddressablesPlatform|RuntimePlatform|TargetPlatform|OpCodes|GraphicsDeviceType))\\.switch\\W' which indicates it is specific to restricted targets '-Switch'. It must not be published",
-          "PackageVersion": "1.18.1"
-        },
-        {
-          "ValidationTest": "NDA Keyword Validation",
-          "ExceptionMessage": "File 'Runtime/Plugins/Switch/SwitchProControllerHID.cs' contains keyword pattern '(?<!(BuildTarget|BuildTargetGroup|BuildSettings|AddressablesPlatform|RuntimePlatform|TargetPlatform|OpCodes|GraphicsDeviceType))\\.switch\\W' which indicates it is specific to restricted targets '-Switch'. It must not be published",
-          "PackageVersion": "1.18.1"
-        },
-        {
-          "ValidationTest": "NDA Keyword Validation",
-          "ExceptionMessage": "File 'Runtime/Plugins/Switch/SwitchSupportHID.cs' contains keyword pattern '(?<!(BuildTarget|BuildTargetGroup|BuildSettings|AddressablesPlatform|RuntimePlatform|TargetPlatform|OpCodes|GraphicsDeviceType))\\.switch\\W' which indicates it is specific to restricted targets '-Switch'. It must not be published",
-          "PackageVersion": "1.18.1"
-        },
-        {
-          "ValidationTest": "NDA Keyword Validation",
-          "ExceptionMessage": "The Input System support Switch Pro controllers on desktop computers via the [`SwitchProControllerHID`](../api/UnityEngine.InputSystem.Switch.SwitchProControllerHID.html) class, which implements basic gamepad functionality.",
-          "PackageVersion": "1.18.1"
-        },
-        {
-          "ValidationTest": "NDA Keyword Validation",
-          "ExceptionMessage": "using UnityEngine.InputSystem.Switch.LowLevel;",
-          "PackageVersion": "1.18.1"
-        },
-        {
-          "ValidationTest": "NDA Keyword Validation",
-          "ExceptionMessage": "namespace UnityEngine.InputSystem.Switch.LowLevel",
-          "PackageVersion": "1.18.1"
-        },
         {
             "ValidationTest": "API Validation",
             "ExceptionMessage": "New assembly \"Unity.InputSystem.TestFramework\" may only be added in a new minor or major version.",