[SYCL] Remove UR objects release checks on Windows

[omarahmed1111]

These e2e tests started failing after PI removal and replacing it with UR (PR) However, they were not related to it.

On Windows, dlls unloading is inconsistent and if we try to release these UR objects manually, inconsistent hangs happen due to a race between unloading the UR adapters dlls (in addition to their dependency dlls) and the releasing of these UR objects (The proxy loader have solved this problem partially here). So, we currently shutdown without releasing them and windows should handle the memory cleanup.

This behaviour is the same old behaviour as before removing PI as on Investigations on this. This was only hidden before PI removal as it was calling the PI entry-point but doesn't make it to UR entry-point and Filecheck logs check for objects release would pass as it only check for the call to the PI entry-point without check that the call was a successful call. That was the PI call for piContextRelease before PI removal:

---> piContextRelease(
        <unknown> : 0000023CC0EBA6C0
) ---> API Called After Plugin Teardown, Functon Call ignored.

Fixes #14768
Fixes #14950
Fixes #14968

[maarquitos14]

Just a few nits, otherwise LGTM.

[maarquitos14]

Please, don't force-push after reviews started, as it makes it difficult for reviewers to know what changes are new and what changes are already reviewed.

[omarahmed1111]

@intel/llvm-gatekeepers Please merge, Thanks!