Plugin clean config

[SchrodingersGat]

Remove PluginConfig objects which have not been matched with a valid for 30 days.

Prevents potential "accumulation" of old plugin configuration objects in the database if the plugin has been removed,
without clearing them out too aggressively.

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[SchrodingersGat]

@matmair LMK what you think of this approach

[wolflu05]

Would that mean if a instance is running for 30 days without any restart, the plugin config gets deleted?

I would rather add a toggle to the uninstall dialog which says remove all data.

[matmair]

I am not sure I see how this is a real improvement of resources. This adds a lot more compute usage with the constant calculations and task runs for saving then a few KB of storage for database settings.
Not to forget that this is a change in the default behavior and therefore will probably have unforeseen consequences.

[SchrodingersGat]

Fair points - this has been replaced by #5653