Bump @emotion & @mui to latest and some cleanup

[VictorVelarde]

Description

Shortcut: 351003

• Bump mui to latest in v5
• Bump to latest @emotion minor
• Removal of styled-components peer dep (cleaning)

Companion PR in c4r-template: ?

Type of change

• Chore

Acceptance

No issues or visual changes in storybook.

A must before the release is also to verify / adapt not only templates but cloud-native

Basic checklist

• Good PR name
• Shortcut link
• Changelog entry
• Just one issue per PR
• GitHub labels
• Proper status & reviewers
• Tests
• Documentation