refactor(NavbarEnvVariant): update master env logic

[cf-remylenoir]

Purpose of PR

Following up on the switcher update from #2920, we want to use the rocket icon for all master environments, whether they are aliases or not.

Preview: https://5fd1dda724cc620021ace8c5-dzcsionulj.chromatic.com/?path=/story/components-navbar--with-different-environments

PR Checklist

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

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Name	Status	Preview	Updated (UTC)
forma-36	✅ Ready (Inspect)	Visit Preview	Oct 30, 2024 9:58am

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Latest commit: 2f33b16

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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.
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