ci: enhance extensions test workflow #3796

Job	Run time
Cross-platform build checks (windows-latest)	6m 35s
Cross-platform build checks (macos-latest)	1m 3s
Build libsql (shared)	2m 18s
Extensions Tests	2m 10s
CR SQLite C Tests	1m 21s
CR SQLite Rust Tests	46s
	14m 13s

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