OsOperation::kill is updated#2

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dmitry-lipetsk wants to merge 2 commits intopostgrespro:masterfrom

dmitry-lipetsk:D20251219_001--os_ops-kill

Commits on Dec 19, 2025

fix: LocalOsOperation::kill uses os.kill, arg "expect_error" is removed
dmitry-lipetsk
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refactoring: OsOperation::kill(self, pid: int, signal: int)
dmitry-lipetsk
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