[CI] Ensure old temp dirs do not exist

[lslusarczyk]

Install dir can exist if old "SYCL Pre Commit on Windows / e2e" job has not finished cleanly. Removing it to be sure it does not exist also on job start.

[aelovikov-intel]

I don't see how the deletion would succeed here if it failed in the previous task. When that happens, we have to manually kill zombie processes and remove files. As such, I don't see benefits, but if somebody from @intel/dpcpp-devops-reviewers sees value in this, I won't object.

[sarnex]

Yeah I don't think this will work, on Windows you can't delete a directory if any file handles to files inside are still open.

[lslusarczyk]

As CI showed this approach does not work. I don't know Windows and I don't have access to this particular machine to learn and experiment how to find zombies and kill them.

The only solution which is accessible to me is to use unique directories. This may be a temporary solution before we implement solution which @sarnex suggested in email thread (check for open files before removal, fail job if found and kill zombies as a cleanup).

[sarnex]

I'll start working on the solution I mentioned now, hopefully it's not too hard.

[lslusarczyk]

Closing as better and working solution is going to be implemented by @sarnex . Thank you for being ready to help with this!

[sarnex]

Thanks for bringing up the issue and working toward a solution!