[OP-145] --op-border-color rename

[Jeremy-Walton]

Task

Fixes OP-145

Why?

The border color token did not match the pattern of other colors. This provides consistency

What Changed

• Rename --op-border-color to --op-color-border

Sanity Check

• Have you updated any usage of changed tokens?
• Have you updated the docs with any component changes?
• [ ] Have you updated the dependency graph with any component changes?
• Have you run linters?
• Have you run prettier?
• Have you tried building the css?
• Have you tried building storybook?
• [ ] Do you need to update the package version?

Screenshots