[stable30] rate limiting for creating federated shares

[backportbot]

Modified backport of #62091

Since NC30 and down don't have request signing, they use a plain rate limit without whitelisting trusted server

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.

[icewind1991]

/backport! to stable29

[backportbot]

The backport to stable29 failed. Please do this backport manually.

# Switch to the target branch and update it
git checkout stable29
git pull origin stable29

# Create the new backport branch
git checkout -b backport/62134/stable29

# Cherry pick the change from the commit sha1 of the change against the default branch
# This might cause conflicts, resolve them
git cherry-pick 4202b2e7

# Push the cherry pick commit to the remote repository and open a pull request
git push origin backport/62134/stable29

Error: Failed to check for changes with origin/stable29: No changes found in backport branch

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