Add httpStatusCode and clickHouseExceptionName to ServerError

[simPod]

Summary

• Adds public readonly int $httpStatusCode and public readonly string|null $clickHouseExceptionName to ServerError
• Parses the ClickHouse exception name (e.g. NOT_IMPLEMENTED) from the error body
• Makes debugging easier without needing to enable SQL logging

Test plan

• Existing testParseCode extended to assert new properties
• New testParseWithoutExceptionName covers fallback when body has no recognizable exception name
• PHPStan and PHPCS pass

https://claude.ai/code/session_01YX19TXMGf89gacogUmxHJM

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.57%. Comparing base (ddb1e57) to head (7cc97a0).
⚠️ Report is 2 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #322      +/-   ##
==========================================
+ Coverage   94.49%   94.57%   +0.07%     
==========================================
  Files          42       42              
  Lines         709      719      +10     
==========================================
+ Hits          670      680      +10     
  Misses         39       39              

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.