Force installing nushell in standard lib tests to fix CI (#14693) #633

Job	Run time
plugins (windows-latest)	12m 3s
fmt-clippy (windows-latest)	9m 57s
plugins (macos-13)	10m 29s
fmt-clippy (macos-13)	5m 13s
std-lib-and-python-virtualenv (ubuntu-20.04, py)	4m 9s
plugins (ubuntu-20.04)	6m 30s
fmt-clippy (ubuntu-20.04)	3m 10s
std-lib-and-python-virtualenv (macos-latest, py)	4m 10s
std-lib-and-python-virtualenv (windows-latest, py)	11m 5s
Build WASM	2m 21s
tests (windows-latest)	15m 26s
Clippy WASM	1m 38s
tests (macos-latest)	4m 45s
tests (ubuntu-20.04)	6m 33s
	1h 37m 29s

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