fix: indexer etl breakage pushing all pairs every block and overwhelming collections (backport #8521)

[mergify]

Closes: #XXX

What is the purpose of the change

The pools weren't cleared at the end of every block, overwhelming data ingest. This fixes the problem by resetting pool tracker at the end of every block, to clear tracked pools.

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This is an automatic backport of pull request #8521 done by Mergify.

[mergify]

Cherry-pick of 79bc52b has failed:

On branch mergify/bp/v25.x/pr-8521
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	both modified:   app/app.go
	both modified:   ingest/indexer/service/indexer_streaming_service.go

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