`karafka.produce` fails validation due to` {:topic=>"does not match the topic allowed format"}` if `karafka.consumer_for` hasn't been called

[technicalpickles]

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Bug Report Details

I started using karafka.produce to produce some messages, but I started getting a failure like:

     WaterDrop::Errors::MessageInvalidError:
       {:topic=>"does not match the topic allowed format"}
     # ./karafka-testing-repro.rb:9:in `block (2 levels) in <main>'
     # -e:1:in `<main>'

It seems that this happens if you haven't called karafka.consumer_for before karafka.produce.

Additional Context

Reproducible case:

RSpec.describe 'karafka testing repro' do
  it 'works' do
    payload = {
      foo: 'bar',
      baz: 1,
    }
    karafka.produce(payload.to_json)
  end
end

Output with --backtrace

❯ bin/rspec karafka-testing-repro.rb --backtrace
Running via Spring preloader in process 6307

Randomized with seed 2582
F

Failures:

  1) karafka testing repro works
     Failure/Error: karafka.produce(payload.to_json)
     
     WaterDrop::Errors::MessageInvalidError:
       {:topic=>"does not match the topic allowed format"}
     # /Users/josh.nichols/.local/share/mise/installs/ruby/3.3.5/lib/ruby/gems/3.3.0/gems/karafka-core-2.4.5/lib/karafka/core/contractable/contract.rb:109:in `validate!'
     # /Users/josh.nichols/.local/share/mise/installs/ruby/3.3.5/lib/ruby/gems/3.3.0/gems/waterdrop-2.7.4/lib/waterdrop/producer.rb:266:in `validate_message!'
     # /Users/josh.nichols/.local/share/mise/installs/ruby/3.3.5/lib/ruby/gems/3.3.0/gems/waterdrop-2.7.4/lib/waterdrop/producer/sync.rb:20:in `produce_sync'
     # /Users/josh.nichols/.local/share/mise/installs/ruby/3.3.5/lib/ruby/gems/3.3.0/gems/karafka-testing-2.4.6/lib/karafka/testing/rspec/helpers.rb:156:in `_karafka_produce'
     # /Users/josh.nichols/.local/share/mise/installs/ruby/3.3.5/lib/ruby/gems/3.3.0/gems/karafka-testing-2.4.6/lib/karafka/testing/rspec/proxy.rb:21:in `produce'
     # ./karafka-testing-repro.rb:9:in `block (2 levels) in <main>'
  
Finished in 0.096 seconds (files took 3 seconds to load)
1 example, 1 failure

Failed examples:

rspec ./karafka-testing-repro.rb:4 # karafka testing repro works

Randomized with seed 2582