[icons] feat: Added virus icon

[jbcolin18]

Fixes #0000

Checklist

• Includes tests
• Update documentation

Changes proposed in this pull request:

Added virus icon to icon library approved by other Palantir designers. I didn't add legacy file types.

Reviewers should focus on:

Icons should render as below screenshot.

Screenshot

[palantirtech]

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[adidahiya]

The icon doesn't show up correctly with the <Icon> react component. I think it's because multiple paths are used. In theory, this should be ok (we should be able to render such SVGs into the DOM), but in practice, it looks like all other icons in Blueprint are drawn with a single <path>, even for disjoint shapes:

layout-grid:

virus:

is there any way you can configure the export from Sketch to only draw one <path> in the icon contents?

[adidahiya]

Actually this could be a problem in the way we optimize svgs with svgo... i'm taking a closer look

[adidahiya]

I removed the "content" field here because it was unused, and I changed the build scripts to allow for this omittance