feat: add 'curved' variant for progress-path component

[jfmcquade]

PR Checklist

• PR title descriptive (can be used in release notes)

Description

Includes minimal changes from #2669 to add a new variant for the progress_path component: curved.

Whilst #2669 was usurped by #2698 for meeting the specific use case (which includes updates to the task_card component as well as adding a new PLH-specific progress path component), the former PR did include a new variant that may as well be preserved – I think it is more attractive than the previous two variants and may be desirable in future.

Git Issues

Closes #2669

Screenshots/Videos

comp_progress_path:

[github-actions]

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[esmeetewinkel]

Functional test passed. Happy to merge without code review since the changes are limited to a single component file.