Custom Emotion SSR config

[joe-bell]

Description

Adds a custom Emotion SSR config to user-portal

Motivation and Context

@bilal-net noticed some weird behaviour with first elements in CSS missing styles, turns out this is the default SSR config for Emotion

emotion-js/emotion#1178

How Has This Been Tested?

n/a

Screenshots

n/a

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist

• I have read the contributing guidelines.
• My code follows the code style of this project.
• My code meets the A11Y Web Accessibility Checklist. If not, please add justification documentation.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.