Remove Object.append(...) from index.ejs

[adamdoyle]

Issue: #7706

What I did

Replaced the following EJS code in lib/core/src/server/templates/index.ejs for the sake of IE11 compatibility:

before:

<% if (typeof globals !== 'undefined' && Object.keys(globals).length) { %>
  <script>
    Object.assign(window, <%= JSON.stringify(globals) %>);
  </script>
<% } %>

after:

<% if (typeof globals !== 'undefined' && Object.keys(globals).length) { %>
  <script>
    <% for (var varName in globals) { %>
        <% if (globals[varName] != undefined) { %>
          window['<%=varName%>'] = <%= JSON.stringify(globals[varName]) %>;
        <% } %>
    <% } %>
  </script>
<% } %>

How to test

• See "To Reproduce" subheading in issue IE11: Object doesn't support property or method 'assign' #7706

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[shilman]

LGTM and tested. @adamdoyle thanks for taking care of this! 🙇