[llvm] [Dexter] Work around flaky LLDB DAP stackTrace response (PR #157090)

[Stephen Tozer via llvm-commits]

SLTozer wrote:

Some kind of workaround is needed for this - do we have confidence that the error is intermittent based on a random chance of getting a bad response from LLDB, though? I think we have to try something, but it would be good if we could get more information in the event that we run out of attempts, so that we aren't back to square 1 if this error ends up appearing again.

https://github.com/llvm/llvm-project/pull/157090