R1:29beb174d3b1

Don't treat Quicksand requests as isWorkflow() or isAjax()

Summary:
Fixes T7061. Although it's very simple, I think this is a complete fix.

Quicksand technically is Ajax and uses Workflow as a transport mechanism, but the server should always pretend the user clicked a normal link when rendering.

Test Plan: Links that were autoconverting into dialogs (like "Edit Task") or otherwise making the wrong behavioral choices now work as expected.

Reviewers: btrahan, chad

Reviewed By: chad

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