Address followup items
What does this MR do and why?
This MR does refactor deduplication strategies and DeduplicatesWhenScheduling
making overrides more logical and readable, by extracting DeduplicatesWhenScheduling
as an abstract class.
It also fixes readability for DuplicateJob.
In order to prevent bugs and issues, we made Gitlab::Databaase::DATABASES to be hash with indifferent access so it can accept both strings and symbols.
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MR acceptance checklist
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Related to #341022 (closed)