feat(components): visual refinements for add, plus and plus2 [JOB-93171]

[chris-at-jobber]

Motivations

Better visual balance of the various "pluses' used to indicate adding something when used standalone or in buttons, menus, etc.

Changes

Changed

• SVG paths for the relevant components

Testing

Verify in Storybook (must run npm run bootstrap first if testing locally)

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