Fix 404 after deleting an indexed cloud

[mawinter69]

When 2 clouds have the same name the second one has a different url with cloudByIndex as additional path element. When deleting the cloud it redirects to .., i.e. /cloud/cloudByIndex/ which produces a 404.
Deleting a cloud now redirects to /cloud

Fixes #26176

Testing done

1. Installed google-compute-engine plugin
2. created 2 clouds that both use google in the clouds name field
3. visit the second cloud and clicked Delete Cloud
4. This does no longer throw a 404

Screenshots (UI changes only)

Before

After

Proposed changelog entries

• Fix 404 after deleting an indexed cloud

Proposed changelog category

/label bug

Proposed upgrade guidelines

N/A

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Desired reviewers

@mention

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[NotMyFault]

Untested, but changeset looks plausible.

[NotMyFault]

Untested, but changeset looks plausible.

[mawinter69]

That is also obsolete with #26233