Fix paging not happening when stdout is interactive but stdin is not #2761

Job	Run time
License checks	1m 18s
Ensure 'cargo fmt' has been run	12s
Documentation	1m 36s
Run tests with updated syntaxes and themes	6m 38s
Extract crate metadata	3s
Run tests with system wide configuration	4m 15s
Minimum supported rust version	3m 20s
aarch64-unknown-linux-gnu (ubuntu-20.04)	7m 18s
arm-unknown-linux-gnueabihf (ubuntu-20.04)	5m 13s
arm-unknown-linux-musleabihf (ubuntu-20.04)	6m 45s
i686-pc-windows-msvc (windows-2019)	9m 43s
i686-unknown-linux-gnu (ubuntu-20.04)	5m 37s
i686-unknown-linux-musl (ubuntu-20.04)	6m 14s
x86_64-apple-darwin (macos-12)	7m 50s
x86_64-pc-windows-gnu (windows-2019)	11m 55s
x86_64-pc-windows-msvc (windows-2019)	10m 54s
x86_64-unknown-linux-gnu (ubuntu-20.04)	5m 0s
x86_64-unknown-linux-musl (ubuntu-20.04)	5m 34s
	1h 39m 25s

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