[lldb] Deflake TestDAP_attach (#108226)
The test failed in
<https://lab.llvm.org/buildbot/#/builders/162/builds/5785> due to frame
variable not being in stop commands, even though the DAP log shows the
command being present there. I'm pretty sure this is a race in the test
the collection of the test log. I fix that by making sure we wait for
the expected output, and also by increasing the timeout (1s is cutting
it very close).
The arm failure link is no longer functional, but I'm fairly certain
that this was the cause of those flakes as well.
