gh-126513: Use helpers for `_Py_Specialize_ConstainsOp` #131841

Job	Run time
Change detection / Compute changed files	10s
Check if Autoconf files are up to date	20s
Check if generated files are up to date	4m 12s
Address sanitizer (ubuntu-24.04)	8m 38s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.0.15)	2m 44s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.1.7)	4m 5s
Docs	0s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.2.3)	2m 40s
Windows MSI${{ '' }}	0s
Hypothesis tests on Ubuntu	6m 8s
Ubuntu SSL tests with OpenSSL (ubuntu-24.04, 3.3.2)	2m 41s
CIFuzz (address)	19m 12s
CIFuzz (undefined)	20m 59s
CIFuzz (memory)	20m 50s
WASI / build and test	5m 47s
Thread sanitizer / Thread sanitizer	3m 56s
Thread sanitizer (free-threading) / Thread sanitizer	6m 51s
Windows / build (arm64)	3m 10s
Windows (free-threading) / build (arm64)	2m 19s
Windows / build and test (Win32)	16m 15s
Windows (free-threading) / build and test (Win32)	24m 40s
Windows / build and test (x64)	15m 39s
macOS (free-threading) / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	7m 40s
Windows (free-threading) / build and test (x64)	23m 35s
macOS / build and test (macos-13)	11m 6s
macOS / build and test (ghcr.io/cirruslabs/macos-runner:sonoma)	5m 42s
Ubuntu / build and test (ubuntu-24.04)	8m 38s
Ubuntu (free-threading) / build and test (ubuntu-24.04)	11m 57s
All required checks pass	3s
	3h 59m 57s

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