fix(occ): hide sensitive data while config:app:set

[AndyScherzinger]

local repo copy of approved PR #49826 ✅

Closes #49826

---

Summary

Do not display sensitive values in CLI output.

Before:

./occ config:app:set --value "secret!" --sensitive --type string my_app my_secret_pass        

⚠️ my pass is visible in output as plain text

Config value 'my_secret_pass' for app 'my_app' is now set to 'secret!', stored as string in fast cache

After:

./occ config:app:set --value "secret!" --sensitive --type string my_app my_secret_pass             

☑️ my pass is displayed as <sensitive>

Config value 'my_secret_pass' for app 'my_app' is now set to '<sensitive>', stored as string in fast cache

---

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• Tests (unit, integration, api and/or acceptance) are included
• Screenshots before/after for front-end changes
• Documentation (manuals or wiki) has been updated or is not required
• Backports requested where applicable (ex: critical bugfixes)

[AndyScherzinger]

/backport to stable31