Fix import_source serialization in migration
What does this MR do and why?
This MR fixes the YAML serialization issue mentioned in the incident: gitlab-com/gl-infra/production#8167 (closed)
The defined ApplicationSetting
class didn't specify serialize :impor_source
so the passed array was stringified and saved to the DB.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Adam Hegyi