[stable32] feat(files_external): convert to delegated settings

[backportbot]

Backport of #59001

Warning, This backport's changes differ from the original and might be incomplete ⚠️

Todo

• Review and resolve any conflicts
• Review and verify the backported changes
• Amend HEAD commit to remove the line stating to skip CI

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

[tanyaka]

/compile

[artonge]

Looks good. Can you make sure that comments are also backported?

For the psalm issue, you can run: composer psalm -- --set-baseline to add the new error to the psalm baseline.

[tanyaka]

Looks good. Can you make sure that comments are also backported?

For the psalm issue, you can run: composer psalm -- --set-baseline to add the new error to the psalm baseline.

Thank you for re-check! I've updated psalm baseline. But don't get what do you mean with "comments" to be backported?

[artonge]

But don't get what do you mean with "comments" to be backported?

The initial PR contains comments that are not present in this backport.

[tanyaka]

But don't get what do you mean with "comments" to be backported?

The initial PR contains comments that are not present in this backport.

Sorry, don't get what you mean. Could you link the comments that you mean, please?

[artonge]

Just one example: