Refactor: `ActiveJobTokenServer::new` no longer returns `Result` #1423

Job	Run time
MSRV (ubuntu-latest)	20s
Test (stable)	32s
Clippy	18s
Test (beta)	34s
Test build-std (aarch64-tvos)	4m 50s
MSRV (windows-latest)	43s
Test (nightly)	27s
Test (linux32)	1m 13s
Test CUDA support	32s
Test (macos)	4m 0s
Rustfmt	6s
Test build-std (aarch64-tvos-sim)	4m 29s
Test (aarch64-macos)	42s
Test build-std (x86_64-tvos)	4m 30s
Test (aarch64-ios)	1m 7s
Test (win32)	1m 41s
Test (win64)	2m 19s
Test (mingw32)	1m 37s
Test (mingw64)	1m 26s
Test (windows-2019)	2m 36s
Test (windows-aarch64, windows-latest, stable, aarch64-pc-windows-msvc, --no-run)	1m 10s
Test (windows-clang, windows-2019, stable, x86_64-pc-windows-msvc, clang, clang++)	2m 10s
Test (windows-clang-cl, windows-2019, stable, x86_64-pc-windows-msvc, clang-cl, clang-cl)	1m 57s
	39m 19s

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