fix(retention): limit series query cache

[thmsobrmlr]

Problem

See https://posthoghelp.zendesk.com/agent/tickets/9449

Changes

This PR limits the amount of entries in the query cache for series to the current amount of entries when getting them from a retention filter.

There is another issue where the retention entities won't be set from cached series. I'll implement a fix after #19800 is in.

How did you test this code?

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Size Change: 0 B

Total Size: 2 MB

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Filename	Size
frontend/dist/toolbar.js	2 MB

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