chore(tests): add `.use_symlinked_temp_dir()` to `TestBuilder` (#19435)

This allows easily using a symlinked temporary directory, which is
useful for debugging issues locally that happen on the CI with a
symlinked temporary directory. For example:

```rs
let context = TestContextBuilder::new()
    .use_temp_cwd()
    .use_symlinked_temp_dir() // add this
    .build();
```

1 files changed, 1 insertions, 1 deletions

diff --git a/test_util/src/lsp.rs b/test_util/src/lsp.rs
index 831df28e9..87dfaf6f9 100644
--- a/test_util/src/lsp.rs
+++ b/test_util/src/lsp.rs
@@ -616,7 +616,7 @@ impl LspClient {
     config: Value,
   ) {
     let mut builder = InitializeParamsBuilder::new();
-    builder.set_root_uri(self.context.deno_dir().uri());
+    builder.set_root_uri(self.context.temp_dir().uri());
     do_build(&mut builder);
     self.write_request("initialize", builder.build());
     self.write_notification("initialized", json!({}));