Drop the unused token-factory wiring from CaptureAction

[loevgaard]

Refs #3.

CaptureAction implemented GenericTokenFactoryAwareInterface and used the trait, but never touched
$this->tokenFactory — a capture needs no token. Only AuthorizeAction mints one, for the callback url.

That was dragging payum/core's deprecated GenericTokenFactoryInterface into the class for nothing, so
removing it halves this package's exposure to the deprecation. The test now pins the intent from the
other side — asserting the action does not implement the interface — so it cannot drift back in.

No behaviour change: Payum's GenericTokenFactoryExtension simply stops injecting a factory that was
never read.

Why #3 cannot be fully fixed

The remaining use in AuthorizeAction is not removable, and the deprecation is inert:

• What we implement is not deprecated. GenericTokenFactoryAwareInterface and
  GenericTokenFactoryAwareTrait carry no deprecation. Only GenericTokenFactoryInterface does —
  "deprecated since 1.3.7 and will be removed in 2.0".
• payum/core 2.0 does not exist. The installed version is 1.7.7, released years after that
  annotation, and our constraint is payum/core: ^1.6, so a hypothetical removal cannot reach us
  silently.
• payum/core still depends on it itself. Payum::__construct() takes a GenericTokenFactoryInterface
  and Payum::getTokenFactory() returns one. It cannot go without a major release of payum/core.
• There is no replacement for what we need. AuthorizeAction calls createNotifyToken() to build
  the callback url. The non-deprecated TokenFactoryInterface::createToken() requires the caller to
  supply the notify path — but that path is consumer-configured via setGenericTokenFactoryPaths()
  (Payum's own default is notify.php; our e2e harness uses notify). Hardcoding it would break
  consumers, which is worse than the deprecation.

So the practical answer is: use what payum/core still ships and still wires, keep the exposure minimal,
and revisit if payum/core ever tags a 2.0.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.40%. Comparing base (993aedf) to head (98824c0).

Additional details and impacted files

@@            Coverage Diff            @@
##                2.x      #50   +/-   ##
=========================================
  Coverage     97.40%   97.40%           
  Complexity      126      126           
=========================================
  Files            14       14           
  Lines           347      347           
=========================================
  Hits            338      338           
  Misses            9        9           

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