Tests

add checkboxes and a couple more test items to testing.md #2605

Job	Run time
Browser Tests	11m 16s
Check Formatting	4m 20s
Core Tests on macOS (x86_64-apple-darwin)	8m 29s
Core Tests on Linux (wasm32-unknown-unknown)	3m 4s
Core Tests on Linux (x86_64-unknown-linux-gnu)	5m 13s
Core Tests on Windows (x86_64-pc-windows-msvc)	14m 17s
Rust Wasm Checks	3m 6s
Core Tests on Windows (i686-pc-windows-msvc)	11m 0s
Build WASM binary	8m 26s
	1h 9m 11s

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