Convert ProjectCacheWorker args to native JSON types

Joe Woodwardrequested to merge
chore/convert-non-native-json-types-for-worker into master

What does this MR do and why?

Convert ProjectCacheWorker args to native JSON types

Sidekiq workers use JSON to serialize job arguments. This places some restrictions on how the classes can be configured and called https://github.com/sidekiq/sidekiq/wiki/Best-Practices

This includes passing symbol arguments to perform_async and perform_in. To ensure the arguments are always the same we should stick to passing strings to perform_now too.

This change converts all of the symbol values for the ProjectCacheWorker

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