test(framework): add dual DB engine coverage with flaky test fixes#6586

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vividctrlalt wants to merge 3 commits intotronprotocol:developfrom

vividctrlalt:test/dual-db-engine-coverage

Commits on Mar 18, 2026

test: add dual DB engine (LevelDB + RocksDB) test coverage
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fix(test): skip LevelDB iterator test on ARM64

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Commits on Mar 19, 2026

fix(config): ARM64 ignores db.engine config instead of failing
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