chore(styles): update horizontal stepper styles

[alizedebray]

I updated the styles quite drastically so that the stepper is CSS only and doesn't require the ngb progress bar to work. I also used multiple CSS tricks to accommodate the current markup and avoid a major change, the code could be further simplified for the v8.

[changeset-bot[bot]]

🦋 Changeset detected

Latest commit: ef3445f037eae507e02b7db3c7b8913ebda5c09e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 14 packages

Name	Type
@swisspost/design-system-styles	Patch
@swisspost/design-system-components-angular-workspace	Patch
@swisspost/design-system-components	Patch
@swisspost/design-system-demo	Patch
@swisspost/design-system-documentation	Patch
@swisspost/internet-header	Patch
@swisspost/design-system-intranet-header-workspace	Patch
@swisspost/design-system-nextjs-integration	Patch
@swisspost/design-system-intranet-header	Patch
@swisspost/design-system-components-react	Patch
@swisspost/design-system-components-angular	Patch
@swisspost/design-system-intranet-header-showcase	Patch
@swisspost/design-system-icons	Patch
@swisspost/design-system-migrations	Patch

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[sonarqubecloud[bot]]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
No data about Coverage
0.0% Duplication on New Code

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