Added WCP mechanism for shutdownSqe

[Santhosha-bk]

Description

CxPlatEventQEnqueue, aka PostQueuedCompletionStatus, can fail because of OOM. The reason for this is that NtSetIoCompletion underneath PQCS must allocate an IO completion packet to add to the target IOCP
Describe the purpose of and changes within this Pull Request.
Added a Wake Completion Packet (WCP) mechanism which will be used as a primary path for shutdownSqe and PQCS will be a backup mechanism.

Old PR #5617

#5369

Testing

Do any existing tests cover this change? Are new tests needed?

Documentation

Is there any documentation impact for this change?

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[guhetier]

Tests show that assertion triggering.

[Santhosha-bk]

Removed assert as the failure is expected