[buffer manager] move epoch notification to after commit

[zekun000]

Description

How Has This Been Tested?

Key Areas to Review

Type of Change

• New feature
• Bug fix
• Breaking change
• Performance improvement
• Refactoring
• Dependency update
• Documentation update
• Tests

Which Components or Systems Does This Change Impact?

• Validator Node
• Full Node (API, Indexer, etc.)
• Move/Aptos Virtual Machine
• Aptos Framework
• Aptos CLI/SDK
• Developer Infrastructure
• Move Compiler
• Other (specify)

Checklist

• I have read and followed the CONTRIBUTING doc
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I identified and added all stakeholders and component owners affected by this change as reviewers
• I tested both happy and unhappy path of the functionality
• I have made corresponding changes to the documentation

[trunk-io]

⏱️ 27m total CI duration on this PR

Job	Cumulative Duration	Recent Runs
rust-doc-tests	6m	🟩
execution-performance / test-target-determinator	6m	🟩
test-target-determinator	5m	🟩
rust-cargo-deny	3m	🟩 🟩
check-dynamic-deps	3m	🟩 🟩
fetch-last-released-docker-image-tag	2m	🟩
general-lints	51s	🟩 🟩
semgrep/ci	51s	🟩 🟩
file_change_determinator	20s	🟩 🟩
file_change_determinator	11s	🟩
execution-performance / single-node-performance	10s	🟩
permission-check	4s	🟩 🟩
permission-check	4s	🟩 🟩
permission-check	2s	🟩
determine-docker-build-metadata	2s	🟩

🚨 1 job on the last run was significantly faster/slower than expected

Job	Duration	vs 7d avg	Delta
execution-performance / single-node-performance	10s	19m

_{settings ⋅ feedback ⋅ docs ⋅ learn more about trunk.io}

[github-actions]

✅ Forge suite realistic_env_max_load success on a01d6889998efa933fa46e54220d9710ce134fbf

two traffics test: inner traffic : committed: 14997.93 txn/s, latency: 2649.28 ms, (p50: 2700 ms, p70: 2700, p90: 2700 ms, p99: 3000 ms), latency samples: 5702620
two traffics test : committed: 99.99 txn/s, latency: 1350.63 ms, (p50: 1300 ms, p70: 1400, p90: 1500 ms, p99: 1600 ms), latency samples: 1760
Latency breakdown for phase 0: ["MempoolToBlockCreation: max: 1.533, avg: 1.501", "ConsensusProposalToOrdered: max: 0.286, avg: 0.284", "ConsensusOrderedToCommit: max: 0.301, avg: 0.293", "ConsensusProposalToCommit: max: 0.586, avg: 0.578"]
Max non-epoch-change gap was: 0 rounds at version 0 (avg 0.00) [limit 4], 0.51s no progress at version 1270 (avg 0.19s) [limit 15].
Max epoch-change gap was: 0 rounds at version 0 (avg 0.00) [limit 4], 0.57s no progress at version 2262715 (avg 0.57s) [limit 16].
Test Ok

• Grafana dashboard
• Humio Logs
• Axiom Logs
• Validator CPU Profile
• Fullnode CPU Profile
• Test runner output
• Test run is land-blocking

[github-actions]

✅ Forge suite compat success on 6593fb81261f25490ffddc2252a861c994234c2a ==> a01d6889998efa933fa46e54220d9710ce134fbf

Compatibility test results for 6593fb81261f25490ffddc2252a861c994234c2a ==> a01d6889998efa933fa46e54220d9710ce134fbf (PR)
1. Check liveness of validators at old version: 6593fb81261f25490ffddc2252a861c994234c2a
compatibility::simple-validator-upgrade::liveness-check : committed: 17516.29 txn/s, latency: 1979.97 ms, (p50: 2100 ms, p70: 2100, p90: 2400 ms, p99: 3600 ms), latency samples: 568380
2. Upgrading first Validator to new version: a01d6889998efa933fa46e54220d9710ce134fbf
compatibility::simple-validator-upgrade::single-validator-upgrading : committed: 4643.41 txn/s, latency: 6692.32 ms, (p50: 7500 ms, p70: 8000, p90: 8300 ms, p99: 8500 ms), latency samples: 95140
compatibility::simple-validator-upgrade::single-validator-upgrade : committed: 4671.62 txn/s, latency: 7309.27 ms, (p50: 8200 ms, p70: 8200, p90: 8500 ms, p99: 8600 ms), latency samples: 166920
3. Upgrading rest of first batch to new version: a01d6889998efa933fa46e54220d9710ce134fbf
compatibility::simple-validator-upgrade::half-validator-upgrading : committed: 4455.53 txn/s, latency: 6798.19 ms, (p50: 7800 ms, p70: 8000, p90: 8500 ms, p99: 8600 ms), latency samples: 100040
compatibility::simple-validator-upgrade::half-validator-upgrade : committed: 4388.11 txn/s, latency: 7720.73 ms, (p50: 8600 ms, p70: 8900, p90: 9100 ms, p99: 9300 ms), latency samples: 153440
4. upgrading second batch to new version: a01d6889998efa933fa46e54220d9710ce134fbf
compatibility::simple-validator-upgrade::rest-validator-upgrading : committed: 9368.04 txn/s, latency: 3250.88 ms, (p50: 3800 ms, p70: 3900, p90: 4100 ms, p99: 4200 ms), latency samples: 167500
compatibility::simple-validator-upgrade::rest-validator-upgrade : committed: 9024.54 txn/s, latency: 3793.16 ms, (p50: 4100 ms, p70: 4100, p90: 4300 ms, p99: 4500 ms), latency samples: 299500
5. check swarm health
Compatibility test for 6593fb81261f25490ffddc2252a861c994234c2a ==> a01d6889998efa933fa46e54220d9710ce134fbf passed
Test Ok

• Grafana dashboard
• Humio Logs
• Axiom Logs
• Validator CPU Profile
• Fullnode CPU Profile
• Test runner output
• Test run is land-blocking