Fix test_lazy_choices_help failure on Python 3.14+ #1643
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Python started raise early errors for invalid help strings, effectively triggering our LazyChoices action to query the options when added.
By using a custom ArgumentParser subclass that disables this check, LazyChoices works as intended.
Note that in real httpie code,
all argument parsing is done via BaseHTTPieArgumentParser subclasses, so this fixes the problem in httpie as well as in the tests.
Directly using BaseHTTPieArgumentParser in test_lazy_choices_help is not trivial, as it would require more setup.
Fixes #1641