[lldb][test] Bump utility expression timeout to 10 minutes (#221691)
LLDB needs to sometimes run utility expressions such as loading
libraries via a call to `dlopen`. These utility expressions have a
timeout associated with them which is only 15 seconds (and 60 on
sanitized builds).
I suspect our expressions reaching this timeout is the reason why
TestLoadUsingPaths.py sometimes fails to load libraries and produces
this error:
```
File "../TestLoadUsingPaths.py", line 78, in test_load_using_paths
self.assertNotEqual(token, lldb.LLDB_INVALID_IMAGE_TOKEN, "Got a valid token")
```
This patch bumps the timeout to 10 minutes. There is no good reason why
this timeout should exist in the first place on test bots, and maybe we
should remove them or make them fatal errors on the test bots. But for
now this patch should at least fix the test randomly failing on very
slow bots.