fix(files_external): Mark password fields for LoginCredentials and SessionCredentials as hidden and optional

[provokateurin]

• Resolves: [Bug]: Password is required for log-in credentials in External storage config #52227

Summary

It was not possible before to make a field a password (in order to censor it in API responses) and also make it hidden so that it doesn't need to be configured in the frontend.

I hope this doesn't break anything, but at least the direction of this should be correct. In case something breaks because the value no longer exists another solution has to be found.

I also found the PHP method writeParameterInput which I first started changing until I realized it was no longer used at all and the logic was moved to the frontend without removing the dead code 🫠

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)

[provokateurin]

/backport to stable31

[provokateurin]

/backport to stable30

[provokateurin]

/backport to stable29

[provokateurin]

/backport to stable28

[provokateurin]

/backport to stable27

[provokateurin]

/backport to stable26

[solracsf]

Backport bot failing? 🤔

[provokateurin]

Yeah it's dead atm, but people are working on it already. If it doesn't work by tomorrow morning I will do the backports myself. I suspect this PR will have conflicts anyway, so manual work will be needed.

[skjnldsv]

/backport to stable31

[backportbot]

The backport to stable31 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable31
git pull origin stable31

# Create the new backport branch
git checkout -b backport/52628/stable31

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 01d2a9f7 db5f6a4e

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/52628/stable31

Error: Failed to clone repository: Failed to clone and cache repo: EACCES: permission denied, mkdir '/app/cache/nextcloud/server'

---

Learn more about backports at https://docs.nextcloud.com/server/stable/go.php?to=developer-backports.

[provokateurin]

@skjnldsv Seems like there will only be conflicts, so everything will have to be done manually.

[skjnldsv]

/backport to stable31

[skjnldsv]

@provokateurin testing the bot anyway :)