fix: Disable flaky test flash_blocks_on_epoch_3 for real this time

Author: jbencin

.github/workflows/bitcoin-tests.yml

@@ -84,7 +84,7 @@ jobs:
           - tests::should_succeed_handling_malformed_and_valid_txs
           - tests::nakamoto_integrations::simple_neon_integration
           # Disable this flaky test. We don't need continue testing Epoch 2 -> 3 transition
-          - tests::nakamoto_integrations::flash_blocks_on_epoch_3_FLAKY
+          # - tests::nakamoto_integrations::flash_blocks_on_epoch_3_FLAKY
           - tests::nakamoto_integrations::mine_multiple_per_tenure_integration
           - tests::nakamoto_integrations::block_proposal_api_endpoint
           - tests::nakamoto_integrations::miner_writes_proposed_block_to_stackerdb