SI-8135 Disabled flaky hyperlinking presentation compiler test

This PR (https://github.com/scala/scala/pull/3275#issuecomment-31986434)
demonstrates that the test is flaky.

The disabled test was introduced with the intent of preventing a
regression (here is the commit
https://github.com/scala/scala/commit/ccacb06c4928fd6aebc2c2539d7565cb079dc625).

It looks like there is a race condition when `askTypeAt(pos)` is called
on `implicitly[Foo[A]].foo` where `pos` is matches the end point of the
former expression. The issue is that the returned Tree is unattributed,
which is why the error "No symbol is associated with tree
implicitly[Foo[A]].foo" is reported.