feat: add environment to navbar switcher

[massao]

Purpose of PR

Add environment name to the navbar switcher

Preview

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Name	Status	Preview	Updated (UTC)
forma-36	✅ Ready (Inspect)	Visit Preview	Sep 6, 2024 3:37pm

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⚠️ No Changeset found

Latest commit: 5b5c5d4b61e8798ab4ed965fffb0b93bec945f37

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``` Some errors occurred when validating the changesets config: The package "@contentful/f36-components" depends on the ignored package "@contentful/f36-avatar", but "@contentful/f36-components" is not being ignored. Please add "@contentful/f36-components" to the `ignore` option. The package "@contentful/f36-components" depends on the ignored package "@contentful/f36-image", but "@contentful/f36-components" is not being ignored. Please add "@contentful/f36-components" to the `ignore` option. The package "@contentful/f36-components" depends on the ignored package "@contentful/f36-header", but "@contentful/f36-components" is not being ignored. Please add "@contentful/f36-components" to the `ignore` option. ```

[damann]

It looks good to me, my only remark would be related to the poor contrast of the caret icon color with its background. @damann what do you think, does it satisfy an accessible contrast ratio?

Let's bump it up to grey500 (contrast ratio 4.57:1)