[Fixes #12304] Move create_tile_layers to backup.sh

[giohappy]

Checklist

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[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 64.18%. Comparing base (d3686f8) to head (a79a1bb).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #12394 +/- ## ======================================= Coverage 64.18% 64.18% ======================================= Files 886 886 Lines 53289 53288 -1 Branches 6586 6586 ======================================= Hits 34201 34201 + Misses 17574 17573 -1 Partials 1514 1514 ```

[giohappy]

Why is the command call removed completely?

@etj see https://github.com/GeoNode/geonode-project/pull/543/files. BTW if you have a better solution fine. Feel free to close this (and the other one)