[JENKINS-60727] Add capability to clean submodules' submodules

JENKINS-26660 added the capability to set the additional 'f' on clean commands to clean submodules. However, it did not add the capability to set the additional 'f' on submodule clean commands (ie, git submodule foreach --recursive git clean -ffdx).

---
Originally reported by mrginglymus, imported from: Add capability to clean submodules' submodules

• assignee: mrginglymus
  
• status: In Progress
  
• priority: Minor
  
• component(s): git-client-plugin, git-plugin
  
• resolution: Unresolved
  
• votes: 0
  
• watchers: 2
  
• imported: 2025-12-02
  

JENKINS-26660 added the capability to set the additional 'f' on clean commands to clean submodules. However, it did not add the capability to set the additional 'f' on submodule clean commands (ie, git submodule foreach --recursive git clean -ffdx).