Remove third-party lazy imports from the Python client

[tamird]

OpenAPI Generator v7 introduced lazy Python model and API imports through the third-party lazy-imports package. OpenAPITools/openapi-generator#24402 replaces that dependency with standard-library lazy imports.

Regenerate the synchronous Kubernetes Python client from merged generator commit 830e9d156960bb7f51a5337f31636a7e73226474, accurately recorded as 7.25.0-SNAPSHOT, and remove lazy-imports from the actual runtime requirements. Apply the existing Kubernetes REST-client patch so strategic-merge and JSON Patch use their correct wire formats.

The corresponding generator change is kubernetes-client/gen#305. #2647 updates the asyncio client independently and follows this change because kubernetes.aio first initializes the synchronous client.

/kind feature

Removed the third-party lazy-imports dependency from the Kubernetes Python client.

[kubernetes-prow]

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[tamird]

/kind feature
/assign @yliaog

[tamirdex]