Test Coverage Icons

[connor4312]

Is your icon request related to a problem? Please describe.

Test coverage UI is coming soon (microsoft/vscode#123713). We should have an icon to represent test coverage

Describe the solution you'd like

Currently there's only a debug-coverage icon which has a light bulb in the "play" button. THis implies we should use the lightbulb to represent coverage is general, but the lightbulb is already used for other purposes. It'd be nice to have a dedicated coverage icon for use in contexts outside "run with coverage", and replace the lightbulb in the existing icon.

The icons I'd need for coverage

• "run with coverage", like the debug-alt icon, replacing the lower ❤️ icon in
  

• "run all with coverage", like debug-all, replacing the upper heart icon in the above screenshot

• Some icon to represent coverage standalone, like debug

  

Describe alternatives you've considered

N/A

Additional context

N/A