Disable language server auto-detection to speed up tests on CI

[krassowski]

References

This was noted in jupyter/nbdime#664 (comment), let's see how much of a boost we can get on JupyterLab CI

Code changes

Disables LSP server auto-detection for unrelated unit tests

Tests which use server include:

• services
• notebook
• outputarea
• debugger

User-facing changes

None

Backwards-incompatible changes

Downstream reusing server start script in tests and relying on LSP will need to adjust their config, but this is very hypothetical (even LSP extension does not do that).

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[krassowski]

No noticeable speedup. Probably this is because gains are much larger on Windows. I guess we can still merge it as it makes the test output cleaner - no more debug messages like:

[D 2023-09-01 16:01:51.854 ServerApp] Checking for /opt/hostedtoolcache/Python/3.11.4/x64/lib/node_modules/bash-language-server/bin/main.js
[D 2023-09-01 16:01:51.854 ServerApp] Checking for /opt/hostedtoolcache/Python/3.11.4/x64/node_modules/bash-language-server/bin/main.js
[D 2023-09-01 16:01:51.854 ServerApp] Checking for /opt/hostedtoolcache/node/18.17.1/x64/lib/node_modules/bash-language-server/bin/main.js
[D 2023-09-01 16:01:51.854 ServerApp] Checking for /opt/hostedtoolcache/node/18.17.1/x64/node_modules/bash-language-server/bin/main.js
[D 2023-09-01 16:01:51.855 ServerApp] bash-language-server/bin/main.js not found in node_modules of [PosixPath('/home/runner/work/jupyterlab/jupyterlab/packages/services'), PosixPath('/opt/hostedtoolcache/Python/3.11.4/x64/share/jupyter/lab/staging'), PosixPath('/opt/hostedtoolcache/Python/3.11.4/x64/lib'), PosixPath('/opt/hostedtoolcache/Python/3.11.4/x64'), PosixPath('/opt/hostedtoolcache/node/18.17.1/x64/lib'), PosixPath('/opt/hostedtoolcache/node/18.17.1/x64')]

[jtpio]

Thanks!