test: run bash-completion tests #917

Job	Run time
Benchmarks	9m 33s
Build (x86_64/linux)	1m 57s
Build (aarch64/macos)	2m 0s
Check for unneeded dependencies	58s
Source code checks (stable)	44s
Build (aarch64/linux)	2m 30s
Source code checks (1.75.0)	34s
Test (linux/x86_64)	1m 38s
Build (wasm32/wasi-0.2)	1m 12s
Test (macOS)	1m 52s
Build (x86_64/windows)	2m 9s
bash-completion tests	8m 58s
OS target tests (Fedora/latest)	20s
OS target tests (Debian/testing)	20s
OS target tests (Arch Linux/latest)	28s
	35m 13s

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