Demos - Move Anti Forgery implementation to shared files (DataGrid / BatchUpdateRequest)

[mpreyskurantov]

Reverts:

• Demos | DataGrid - BatchUpdateRequest: Support BackEnd / EndPoint Anti Forgery (all frameworks) #32057

Moves anti forgery implementation to shared source (for jQuery and modular / frameworks):

• Move anti-forgery implementation in demos to shared  #32322

Applied for the original DataGrid/BatchUpdateRequest demo / scenario via 1 line:

/jQuery/index.html:

<script src="/shared/anti-forgery/jquery.js"></script>

Frameworks:

import 'anti-forgery';