Cleanup parses all the cache errors

[Swatinem]

Because we have different retry / expiration policies for different cache errors, we are eagerly parsing the CacheError in check_expiry.

Though this code path is used both in main symbolicator, as well as in the cleanup job. Parsing the CacheError variants from the file involves String::from_utf8_lossy, which allocates and can thus OOM the cleanup task.

It is a bit weird though that the cleanup task is using as much memory and OOM-ing, as ideally none of these errors should not be that large ideally.

[jernejstrasner]

About half of this is done.