Fix memory leak in ServerSendIp error paths by adding missing CXPLAT_FREE calls

[Copilot]

The ServerSendIp function in quicipserver.cpp was leaking memory in two error paths where allocated buffers were not being freed before returning.

Issue:
The function allocates memory using CXPLAT_ALLOC_PAGED but failed to free it when either StreamOpen or StreamStart operations failed:

auto SendBufferRaw = CXPLAT_ALLOC_PAGED(sizeof(QUIC_BUFFER) + sizeof(QUIC_ADDR), QUIC_POOL_TOOL);

// Error path 1: StreamOpen failure - no cleanup
if (QUIC_FAILED(Status = MsQuic->StreamOpen(...))) {
    printf("StreamOpen failed, 0x%x!\n", Status);
    return;  // Memory leak!
}

// Error path 2: StreamStart failure - no cleanup  
if (QUIC_FAILED(Status = MsQuic->StreamStart(...))) {
    printf("StreamStart failed, 0x%x!\n", Status);
    MsQuic->StreamClose(Stream);
    return;  // Memory leak!
}

Solution:
Added CXPLAT_FREE(SendBufferRaw, QUIC_POOL_TOOL); calls before returning in both error paths to ensure proper memory cleanup. This matches the pattern already used in other error paths within the same function and ensures every allocation has a corresponding deallocation.

The fix is minimal and surgical - only two lines added to prevent memory leaks without affecting any existing functionality.

Fixes #5255.

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 86.37%. Comparing base (4aeadf8) to head (6e1021a).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5324      +/-   ##
==========================================
- Coverage   86.58%   86.37%   -0.22%     
==========================================
  Files          59       59              
  Lines       18331    18331              
==========================================
- Hits        15872    15833      -39     
- Misses       2459     2498      +39     

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