Add optional capture-output writer to run_app() #2247

Job	Run time
Integration tests (macos-latest)	1m 50s
Integration tests (macos-latest)	1m 50s
Rustfmt	11s
Rustfmt	11s
Clippy	46s
Clippy	46s
Integration tests (ubuntu-latest)	2m 13s
Integration tests (ubuntu-latest)	2m 13s
Code coverage	2m 50s
Code coverage	2m 50s
Unit tests (macos-latest, aarch64-apple-darwin, false)	1m 58s
Unit tests (macos-latest, aarch64-apple-darwin, false)	1m 58s
Unit tests (macos-12, x86_64-apple-darwin, false)	1s
Unit tests (macos-12, x86_64-apple-darwin, false)	1s
Unit tests (windows-latest, x86_64-pc-windows-msvc, false)	6m 17s
Unit tests (windows-latest, x86_64-pc-windows-msvc, false)	6m 17s
Unit tests (ubuntu-latest, x86_64-unknown-linux-gnu, false)	2m 19s
Unit tests (ubuntu-latest, x86_64-unknown-linux-gnu, false)	2m 19s
Unit tests (ubuntu-latest, x86_64-unknown-linux-musl, true)	2m 54s
Unit tests (ubuntu-latest, x86_64-unknown-linux-musl, true)	2m 54s
Unit tests (ubuntu-latest, i686-unknown-linux-gnu, true)	2m 42s
Unit tests (ubuntu-latest, i686-unknown-linux-gnu, true)	2m 42s
Unit tests (ubuntu-latest, arm-unknown-linux-gnueabihf, true)	3m 9s
Unit tests (ubuntu-latest, arm-unknown-linux-gnueabihf, true)	3m 9s
Unit tests (ubuntu-latest, aarch64-unknown-linux-gnu, true)	2m 56s
Unit tests (ubuntu-latest, aarch64-unknown-linux-gnu, true)	2m 56s
	1h 0m 12s

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