Fix LanguageClientManager unit tests #254

Job	Run time
Test / Linux (5.8 - jammy)	3m 11s
Test / Linux (5.8 - jammy)	3m 11s
Test / Windows (${{ matrix.swift_version }} - ${{ ((contains(matrix.swift_version, 'nightly') && 'windows-2019') \|\| 'windows-2022') }})	0s
Test / Windows (${{ matrix.swift_version }} - ${{ ((contains(matrix.swift_version, 'nightly') && 'windows-2019') \|\| 'windows-2022') }})	0s
Test / Linux (5.9 - jammy)	3m 38s
Test / Linux (5.9 - jammy)	3m 38s
Test / Linux (5.10 - jammy)	8m 0s
Test / Linux (5.10 - jammy)	3m 14s
Test / Linux (6.0 - jammy)	4m 46s
Test / Linux (6.0 - jammy)	4m 46s
Test / Linux (nightly-6.0 - jammy)	5m 5s
Test / Linux (nightly-6.0 - jammy)	5m 5s
Soundness / Broken symlinks check	5s
Soundness / Broken symlinks check	5s
Soundness / API breakage check	0s
Soundness / API breakage check	0s
Soundness / Documentation check	0s
Soundness / Documentation check	0s
Soundness / Format check	0s
Soundness / Format check	0s
Soundness / License headers check	0s
Soundness / License headers check	0s
Soundness / Python lint check	6s
Soundness / Python lint check	6s
Soundness / Shell check	43s
Soundness / Shell check	43s
Soundness / Unacceptable language check	3s
Soundness / Unacceptable language check	3s
Soundness / YAML lint check	3s
Soundness / YAML lint check	3s
	46m 34s

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