Update Copilot actions UI (icon + phrasing) #80960
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Per recent PM guidance, we should update the UI Copilot actions for consistency. See this internal AzDO work item for additional details: https://devdiv.visualstudio.com/DevDiv/_workitems/edit/2562650
Before
Implement with Copilot

Describe with Copilot

After
Implement with Copilot -> Implement (and add sparkle icon)

Describe with Copilot -> Describe
