SHS-NG M7: Add cleaning of old elements from the store. #17
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This change restores the functionality that keeps a limited number of
different types (jobs, stages, etc) depending on configuration, to avoid
the store growing indefinitely over time.
The feature is implemented by creating a new type (ElementTrackingStore)
that wraps a KVStore and allows triggers to be set up for when elements
of a certain type meet a certain threshold. Triggers don't need to
necessarily only delete elements, but the current API is set up in a way
that makes that use case easier.
The new store also has a trigger for the "close" call, which makes it
easier for listeners to register code that should be run before the
store is closed. This cleans up the code in AppStateStore a bit.
The old configurations for cleaning up the stored elements from the core
and SQL UIs are now active again, and the old unit tests are re-enabled.