Move tenure extend, reorg, and tx replay related tests to their own sub modules for easier groking

Signed-off-by: Jacinta Ferrant <jacinta@stackslabs.com>

Author: jacinta-stacks

.github/workflows/bitcoin-tests.yml

@@ -71,7 +71,7 @@ jobs:
           tests::neon_integrations::run_with_custom_wallet
           tests::neon_integrations::test_competing_miners_build_anchor_blocks_on_same_chain_without_rbf
           tests::neon_integrations::test_one_miner_build_anchor_blocks_on_same_chain_without_rbf
-          tests::signer::v0::tenure_extend_after_2_bad_commits
+          tests::signer::v0::tenure_extend::tenure_extend_after_2_bad_commits
           tests::stackerdb::test_stackerdb_event_observer
           tests::stackerdb::test_stackerdb_load_store
           # Epoch tests are covered by the epoch-tests CI workflow, and don't need to run