test: add php client test into ci pipeline

[xuefengze]

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What's changed and what's your intention?

https://buildkite.com/risingwavelabs/integration-tests/builds/589

Checklist

• I have written necessary rustdoc comments
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Release note

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[lmatz]

link #14640 as it was first found in PHP client test, although it does not block the tests

[lmatz]

LGTM, thanks