[indexer-alt] pruning tests for kv_epoch_ends and pipelines that don't need CpSeqeuenceNumbers

[wlmyng]

Description

Extend TestCheckpointDataBuilder to advance an epoch by creating an advance epoch tx with or without the SystemEpochInfoEvent depending on safe_mode. Usage:

        let mut builder = TestCheckpointDataBuilder::new(0);
        let checkpoint = Arc::new(builder.advance_epoch(true));
        let values = KvEpochEnds.process(&checkpoint).unwrap();
        KvEpochEnds::commit(&values, &mut conn).await.unwrap();

I had originally considered extending the current tx workflow of builder.start_transaction() to then .advance_epoch().build_checkpoint(), but ultimately kept it standalone as we'd largely be discarding modifications if any made to the current transaction. A user can still create multiple transactions for the checkpoint, and after .finish_transaction(), would call advance_epoch() instead of build_checkpoint().

This saves us from having to use simulacrum to test epoch-boundary behavior (and dealing with potential flakiness)

Test plan

New tests written

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