[Backport 7.x] Extract class to store Authentication in context #52183
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This change extracts the code that previously existed in the
"Authentication" class that was responsible for reading and writing
authentication objects to/from the ThreadContext.
This is needed to support multiple authentication objects under
separate keys.
This refactoring highlighted that there were a large number of places
where we extracted the Authentication/User objects from the thread
context, in a variety of ways. These have been consolidated to rely on
the SecurityContext object.
Backport of: #52032