[hcs] Remove COM port device from serial

[xmkg]

Attaching a COM port device to the serial output adversely affects the boot time (adds around ~50s), as the Linux kernel defaults to 9600 baud and there is no clean way to change that.

Removing the COM port device and the named pipe for the time being, as it was a troubleshooting escape hatch anyway.

[Copilot]

🟡 Changes recommended

Existing exact-JSON unit tests will fail until their COM-port expectations are updated.

Once you've addressed the issues Copilot identified, you can request another Copilot review.

Pull request overview

Removes HCS serial COM-port configuration to improve VM boot time.

Changes:

• Removes the UEFI COM-port console.
• Removes the named-pipe COM-port device.

File summaries

File	Review
src/platform/backends/hyperv_api/hcs/hyperv_hcs_create_compute_system_params.cpp	Removes COM-port configuration from generated HCS JSON. Critical: update all six exact-JSON unit-test expectations to match.

Review details

• Files reviewed: 1/1 changed files
• Comments generated: 1
• Review effort level: Balanced

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[Copilot]

🟢 Approval recommended

The only remaining feedback is a non-blocking formatter-argument cleanup.

Review details

Suppressed comments (1)

src/platform/backends/hyperv_api/hcs/hyperv_hcs_create_compute_system_params.cpp:73

• Removing the only {2} substitution leaves params.name as an unused formatting argument and the remaining placeholders starting at {3}. This makes the formatter’s argument mapping misleading; please renumber {3}–{6} to {2}–{5} and remove params.name from the format_to call.

                    }}

• Files reviewed: 2/2 changed files
• Comments generated: 0 new
• Review effort level: Balanced

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 72.63%. Comparing base (3d5114a) to head (306c51c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5222   +/-   ##
=======================================
  Coverage   72.63%   72.63%           
=======================================
  Files         337      337           
  Lines       18196    18196           
=======================================
  Hits        13214    13214           
  Misses       4982     4982           

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