feat(NavbarSwitcher): improve env switcher salience

[cf-remylenoir]

Purpose of PR

For our users to easily understand what space and environment they are working in.

• Ticket: https://contentful.atlassian.net/browse/CFISO-2011
• Design: https://www.figma.com/design/RBKfzEzcmiC974nFdtI2wK/Modern-%26-Scalable-%E2%80%93-2024-Webapp-Navigation?node-id=7319-31174&node-type=section&m=dev

QA

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PR Checklist

• [x] I have read the relevant readme.md file(s)
• [x] All commits follow our Git commit message convention
• [x] Tests are added/updated/not required
• [x] Tests are passing
• [x] Storybook stories are added/updated/not required
• [x] Usage notes are added/updated/not required
• [x] Has been tested based on Contentful's browser support
• [x] Doesn't contain any sensitive information

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Latest commit: e7c85ecbb3e95c26388446e1ed82c0704f707b4b

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Name	Status	Preview	Updated (UTC)
forma-36	✅ Ready (Inspect)	Visit Preview	Oct 25, 2024 9:48am