Use local block processing in CI instead of external API sync

The hivesense-sync container requires access to the external API at
api.hive.blog/hivesense-api to fetch pre-computed embeddings. This fails
in CI because:
1. The external API returns operations for blocks beyond the test data
2. The test block_log only contains 1M blocks, but the API expects 1.2M+

Set HIVESENSE_CONFIGURATION=local to use hivesense-local.yaml which runs
the hivesense-block-processing container. This processes blocks locally
using ollama to generate embeddings, which is appropriate for CI testing.