APIv5: Drop domain_whitelist_raw and domain_blacklist_raw from application_settings

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Summary

gitlab-ce!31149 Added domain_whitelist and domain_blacklist.

Improvements

Cleaning.

Risks

Breaks code using the older API. Probably not many as it was broken (see gitlab-foss!31149 (merged))

Involved components

• app/controllers/admin/application_settings_controller.rb
• app/helpers/application_settings_helper.rb