[application/connect] simplify connection logic ``application.connect`` now either sets a full featured ``DBAPISession`` to the ``WebRequest`` object or raises ``AuthenticationError``. The creation and usage of a fake DBAPISession is now handled by ``main_handle_request`` when needed. This means that fake DBAPISession are no longer tracked by the session manager and that user are not given anyway to retrieve them for a later request. This fake DBAPISession is still passed to ``core_handle`` because multiple cubes like registration or forgotten password need this behavior. We would like to get ride of it in the future. This clarification of the connection API greatly simplifies ``DBAPISession`` retrieval//creation process opening the way to improvements in this area. Related to #2503918

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[MESSAGES CONTROL]

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disable-msg = C0301

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[VARIABLES]

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# Enable / disable this checker

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enable-variables = yes

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additional-builtins = _, display_name

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[BASIC]

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required-attributes=

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attr-rgx = (w|[a-z_][a-z0-9_]{2,30})

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variable-rgx = (w|[a-z_][a-z0-9_]{2,30})$

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argument-rgx = (w|[a-z_][a-z0-9_]{2,30})$

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[TYPECHECK]

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generated-members=debug,info,notice,warning,error,critical,exception