schemachange: refactor GC job code #55737
Merged
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To implement #48775 I will be modifying the schema GC code to
add support for destroying tenants data. I noticed that the
current code has redundant repetitions which makes it hard to
understand and modify.
The logic for computing new deadline and refreshing tables is
being repeated in 3 code blocks - I have merged them together.
Release note: none.