feat: remove bootstrap as dependency

[danielleroux]

🆕 What is the new behavior?

Remove bootstrap dependencies

Points to clarify:

• Should we introduce .h1 - .h6 utility css classes? (.typography-h1 already exist)
• Update snapshots
• Add snapshot test which imports bootstrap as dependency

🏁 Checklist

A pull request can only be merged if all of these conditions are met (where applicable):

• 🦮 Accessibility (a11y) features were implemented
• 🗺️ Internationalization (i18n) - no hard coded strings
• 📲 Responsiveness - components handle viewport changes and content overflow gracefully
• 📄 Documentation was reviewed/updated (pnpm run docs)
• 🧪 Unit tests were added/updated and pass (pnpm test)
• 📸 Visual regression tests were added/updated and pass (Guide)
• 🧐 Static code analysis passes (pnpm lint)
• 🏗️ Successful compilation (pnpm build, changes pushed)

👨‍💻 Help & support

[changeset-bot]

🦋 Changeset detected

Latest commit: 353136e

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

This PR includes changesets to release 5 packages

Name	Type
@siemens/ix	Major
@siemens/ix-aggrid	Patch
@siemens/ix-angular	Major
@siemens/ix-react	Major
@siemens/ix-vue	Major

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[sonarqubecloud]

Quality Gate passed

Issues
1 New issue
0 Accepted issues

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

See analysis details on SonarQube Cloud