Correctly restore unstable encoding corpus and create tokio runtime only once per process #32029

Job	Run time
lint-toml	10s
Python (test)	2m 17s
Python (lint)	36s
Rust (docs)	2m 33s
validate-workflow-yaml	7s
C API test build	38s
Rust build (with tokio dispatcher)	50s
Rust build (wasm32 with default features)	52s
C/C++ (lint)	11s
SQL logic tests	1m 46s
Check build with minimal dependencies	2m 2s
Rust (lint)	2m 7s
Java	2m 32s
WASM integration smoke test	5m 27s
Rust build (default features)	2m 37s
Rust (lint, no default)	2m 29s
Check generated source files are up to date	44s
Rust tests (linux-arm64)	4m 33s
Rust tests (windows-x64)	7m 43s
C++ build	1m 21s
License Check and Audit Check (bans licenses sources)	58s
Rust build (all-features)	2m 52s
License Check and Audit Check (advisories)	55s
	46m 20s

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