test: improve lock_manager branch coverage to 100%

[poyrazK]

Summary

• Add SharedAcquireAbortedTxn — covers acquire_shared abort path (lines 37-39)
• Add ExclusiveAcquireAbortedTxn — covers acquire_exclusive abort path (lines 90-92)
• Add ExclusiveAcquireTimeout — covers timeout path (lines 105-108)
• Add AlreadyExclusiveReturn — covers already-held exclusive return (line 73-75)
• Add SharedAfterExclusiveSameRID — shared compat after exclusive
• Add LockUpgrade — covers SHARED→EXCLUSIVE upgrade path (line 76)
• Result: 100% branch coverage (116/116 branches)

Test plan

• make lock_manager_tests && ./lock_manager_tests — 19 tests pass
• Verified gcov branch coverage: 116/116

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3c2235c5-afc8-4d5b-aa42-bfc89ad99227

📥 Commits

Reviewing files that changed from the base of the PR and between d99d808 and 49992ce.

📒 Files selected for processing (1)

• tests/lock_manager_tests.cpp

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch test/lock-manager-coverage

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[poyrazK]

It's okay to merge