Use NETVSC_RECV/SEND_SECTION_SIZE constants instead of hardcoded values throughout ring buffer verification

[Copilot]

All ring buffer calculations in verify_ring_buffer_settings used hardcoded 1728/6144 even after NETVSC_RECV_SECTION_SIZE/NETVSC_SEND_SECTION_SIZE constants were introduced, creating drift risk between tolerance computation and buffer size math.

Changes

• Replace all remaining 1728 → NETVSC_RECV_SECTION_SIZE and 6144 → NETVSC_SEND_SECTION_SIZE in:
  • original_rxbuffer / original_txbuffer (sections → MB conversion)
  • expected_rx / expected_tx (MB → sections conversion)

# Before
original_rxbuffer = round((original_rx * 1728) / (1024 * 1024))
original_txbuffer = round((original_tx * 6144) / (1024 * 1024))
expected_rx = int((rxbuffer * 1024 * 1024) / 1728)
expected_tx = int((txbuffer * 1024 * 1024) / 6144)

# After
original_rxbuffer = round((original_rx * NETVSC_RECV_SECTION_SIZE) / (1024 * 1024))
original_txbuffer = round((original_tx * NETVSC_SEND_SECTION_SIZE) / (1024 * 1024))
expected_rx = int((rxbuffer * 1024 * 1024) / NETVSC_RECV_SECTION_SIZE)
expected_tx = int((txbuffer * 1024 * 1024) / NETVSC_SEND_SECTION_SIZE)

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[LiliDeng]

@copilot please fix the CI error

nox > flake8 
./lisa/microsoft/testsuites/network/networksettings.py:118:10: N806 variable 'NETVSC_RECV_SECTION_SIZE' in function should be lowercase
./lisa/microsoft/testsuites/network/networksettings.py:119:10: N806 variable 'NETVSC_SEND_SECTION_SIZE' in function should be lowercase
./lisa/microsoft/testsuites/network/networksettings.py:175:26: BLK100 Black would make changes.

[Copilot]

@copilot please fix the CI error

...

Fixed in d65f993:

• N806: Moved NETVSC_RECV_SECTION_SIZE and NETVSC_SEND_SECTION_SIZE to module level (uppercase is only valid for module-level constants per PEP 8)
• BLK100: Collapsed .is_between(...) calls to single lines per Black formatting