Draft: [SYCL] Fixes memory dependency leaks caused by failed kernel enqueue

[steffenlarsen]

If a kernel enqueue fails the runtime will immediately try and clean it up. However, if it has any dependencies or users the cleanup will be skipped. This can cause the dependencies to stay alive and leak. These changes forces a full sub-graph cleanup of the command if enqueuing failed. Additionally, sub-graph cleanup is changed to account for failed kernel enqueues and will remove the failed command from its leaves.

[steffenlarsen]

This is a reopening of https://github.com/intel/llvm/pull/5120 intended to isolate the failures caused by it.

[steffenlarsen]

/summary:run

[bso-intel]

/summary:run

[steffenlarsen]

Closing this in favor of https://github.com/intel/llvm/pull/7594.