basic-code-intel: Slow symbols fetch causes hover loading indicator to be shown

Created by: sqs

Repro:

1. Go to https://sourcegraph.com/github.com/torvalds/linux@a88cc8da0279f8e481b0d90e51a0a1cffac55906/-/blob/fs/btrfs/btrfs_inode.h#L43:9&tab=references (to show the hover)

Actual: The hover shows loading, "Go to definition", and "Find references" for a while. Eventually only "Find references" remains.

Expected: It should "know" sooner that symbols will time out for this repository, and it should only show "Find references".