Tests

Refactor `_StoreCallSig` to inline form #1997

Job	Run time
run-mypy	16s
coverage	2m 7s
pyright-scan-docs	2m 34s
check-repo-format	13s
run-pyright	31s
smoke-test-pydantic-v2	1m 37s
test-against-pre-releases-of-dependencies	1m 23s
test-docs-builds	39s
test-minimum-dependencies	1m 24s
test-on-windows	2m 11s
tests (3.9)	1m 23s
test-third-party	3m 30s
tests (3.10)	1m 26s
tests (3.11)	1m 16s
tests (3.12)	1m 27s
tests (3.13)	1m 21s
	23m 18s

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