build

Refactor: Align Holdout implementation with Swift SDK #511

Job	Run time
linting	8s
test (3.10)	55s
lint_markdown_files	57s
test (3.12)	46s
test (3.11)	51s
test (pypy-3.10)	1m 49s
test (pypy-3.9)	1m 52s
integration_tests / test	5s
type-check (3.10)	13s
test (3.9)	47s
type-check (pypy-3.9)	18s
type-check (3.12)	14s
type-check (3.9)	12s
type-check (3.11)	15s
fullstack_production_suite / test	6s
type-check (pypy-3.10)	15s
	9m 43s

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