[Serializer] Fix denormalization of object with typed constructor arg (not castable) and with COLLECT_DENORMALIZATION_ERRORS

[lyrixx]

Q	A
Branch?	5.4
Bug fix?	yes
New feature?	no
Deprecations?	no
Tickets
License	MIT
Doc PR

There is already a test for constructor instantiation but it worked "by chance".
The test is testCollectDenormalizationErrorsWithConstructor.
It worked because $reflectionClass->newInstanceArgs($params) works if
one give a string value that should fit in a bool type. PHP casts
automatically the value for us. (see: https://3v4l.org/GYr0T)

Now we ensure to not throw an exception if the instantiation cannot be
done. The mismatch is already collected few lines above, so there
nothing to do more

[nicolas-grekas]

Thank you @lyrixx.