fix cleanup command
move all callcenter related code to callcenter app
simplify fixturegenerator
fixup after moving code
Merge pull request #4359 from dimagi/callcenter

Callcenter cleanup
update staging.yaml

[ci skip]
Merge remote-tracking branch 'origin/archive-products+explicit_case_processing' into autostaging
Merge remote-tracking branch 'origin/explicit_case_processing' into autostaging
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Merge remote-tracking branch 'origin/refactor-domain-copy2' into autostaging
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Merge remote-tracking branch 'origin/custom_user_data' into autostaging
Merge remote-tracking branch 'lwyszomi/better_date_filters_improvment' into autostaging