feat(components): add part body to the post-accordion-item .accordion-body shadowdom element

[oliverschuerch]

📄 Description

We already did the same in our next version and got a request to make this available as well on v9.

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📝 Checklist

• ✅ My code follows the style guidelines of this project
• 🛠️ I have performed a self-review of my own code
• 📄 I have made corresponding changes to the documentation
• ⚠️ My changes generate no new warnings or errors
• 🧪 I have added tests that prove my fix is effective or that my feature works
• ✔️ New and existing unit tests pass locally with my changes

[changeset-bot]

🦋 Changeset detected

Latest commit: 96d227b

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

This PR includes changesets to release 17 packages

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

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[swisspost-bot]

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[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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