test: add missing command error tests and clean up lint directives

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Bencher

Report	Wed, June 19, 2024 at 17:40:03 UTC
Project	theseus-rs/postgresql-embedded
Branch	add-missing-tests
Testbed	localhost

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Benchmark	Latency	Latency Results nanoseconds (ns)
extract	➖ (view plot)	156,240.00
lifecycle	➖ (view plot)	1,116,100,000.00

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Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 99.78%. Comparing base (459c15d) to head (3e0bcac).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #78 +/- ## ========================================== + Coverage 99.42% 99.78% +0.36% ========================================== Files 59 59 Lines 7766 7768 +2 ========================================== + Hits 7721 7751 +30 + Misses 45 17 -28 ```

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