Remove un-needed target when upgrading to v2 BuildTools

[tarekgh]

We have done some change in the PR dotnet/coreclr#11482 to change the license Url for packaging. because coreclr repo not using v2 of the buildtools we had to hack this by adding the temporary target OverrideLicenseUrl in the src/.nuget/dir.targets files. This target should be removed after upgrading to v2 of the buildtools and need to ensure when removing it the license Url in the packages nuspec files is correct

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