chore(tests): enable lsp debug logging to a file

The file path looks like
yazi.nvim/integration-tests/test-environment/testdirs/dir-mvZoqB/.local/state/nvim/lsp.log

Author: mikavilpas

documentation/for-developers/lsp-renaming.md

@@ -44,3 +44,10 @@ neovim->>neovim: apply changes to related files
 neovim->>lsp: send 'renaming finished' notification (didRenameFiles)
 neovim->>neovim: user saves changes
 ```
+
+## Debugging for developers
+
+The e2e test environment should enable logging of all lsp requests and
+responses. Each test run has its own log file, and you can find it in a
+directory such as
+`integration-tests/test-environment/testdirs/dir-rNJosm/.local/state/nvim/lsp.log`

integration-tests/test-environment/.config/nvim/init.lua

@@ -32,6 +32,8 @@ vim.o.swapfile = false
 local thisfile = vim.fn.expand("<sfile>")
 local repo_root = vim.fn.fnamemodify(thisfile, ":h:h:h:h:h:h:h")
 
+vim.lsp.set_log_level("debug")
+
 -- for CI, use a single log file location and put it in a known location. This
 -- way it's easy to display the log file contents after each test using
 -- showYaziLog() and removeYaziLog().