Change S3Client to use user-provided storage_options even in Studio (… #1464

Job	Run time
check-docs / make-docs (html)	2m 19s
check-docs / make-docs (doctest)	2m 10s
check-package / init-store	2s
check-docs / make-docs (linkcheck)	1m 58s
check-schema / schema	10s
check-typing / mypy	2m 13s
check-package / pkg-build (ubuntu-latest)	18s
check-package / pkg-check (ubuntu-latest, 3.8)	3m 5s
check-package / pkg-check (ubuntu-latest, 3.10)	3m 16s
check-package / pkg-check (macos-13, 3.8)	1m 56s
check-package / pkg-check (macos-13, 3.10)	2m 18s
check-package / pkg-check (windows-latest, 3.8)	3m 28s
check-package / pkg-check (windows-latest, 3.10)	3m 28s
check-package / pkg-guardian	1s
	26m 42s

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