[LinkTest] Fix speed change (200G->400g) test issue#969

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Rancho333-CLS wants to merge 2 commits intofacebook:mainfrom

Rancho333-CLS:LinkTest_speedChange

Commits on Mar 2, 2026

[LinkTest] Fix speed change (200G->400g) test issue
Rancho333-CLS
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Commits on Mar 3, 2026

[LinkTest] Add a comment before calling updateCablePorts() to explain why it is needed
Rancho333-CLS
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