Previously in `perform_enqueued_jobs`, `deserialize_arguments_if_needed`
was called before calling `perform_now`. When a record no longer exists
and is serialized using GlobalID this led to raising
an `ActiveJob::DeserializationError` before reaching `perform_now` call.
This behaviour makes difficult testing the job `discard_on/retry_on` logic.
Now `deserialize_arguments_if_needed` call is postponed to when `perform_now`
is called.
Example:
```ruby
class UpdateUserJob < ActiveJob::Base
discard_on ActiveJob::DeserializationError
def perform(user)
# ...
end
end
User.destroy_all
assert_nothing_raised do
perform_enqueued_jobs only: UpdateUserJob
end
assert_no_enqueued_jobs
```
Before this changes the test will fail, now it passes.
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