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

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

Documentation

[guhetier]

@Santhosha-bk Can you please rebase this?
It has been hitting we addressed last week.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 85.64%. Comparing base (4973cde) to head (3fc53de).
⚠️ Report is 17 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5906      +/-   ##
==========================================
+ Coverage   84.05%   85.64%   +1.59%     
==========================================
  Files          60       60              
  Lines       18755    18730      -25     
==========================================
+ Hits        15764    16042     +278     
+ Misses       2991     2688     -303     

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[Santhosha-bk]

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