Is your feature request related to a problem? Please describe.
Having the possibility to add Max Concurrent Challenges on the controller by a helm value

Describe the solution you'd like
Add a property on helm values for Max Concurrent Challenges

Describe alternatives you've considered
Change arguments on the controller to add the parameter

Environment details (remove if not applicable):

• cert-manager version: 1.9.1
• Install method: helm

/kind feature