Issue #3605741: Use site select for the exposed redirect Site filter

The exposed Site filter on the redirect admin view used a raw text input requiring the site ID. Switch it to the site_select element so admins filter by site label. Keep the filter hidden on non-default sites, which are already scoped to their own redirects, and guard the view lookup against non-ViewExecutable values.

Adds Unit test coverage for the exposed form alteration.

Closes #3605741

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