fix: Update endpoint getEnvironment RTK response

[novakzaballa]

Thanks for submitting a PR! Please check the boxes below:

• I have run pre-commit to check linting
• I have filled in the "Changes" section below?
• I have filled in the "How did you test this code" section below?
• I have used a Conventional Commit title for this Pull Request

Changes

• Update endpoint getEnvironment RTK response

How did you test this code?

• Go to the Segments page
• Click any segments
• Open the Console in your browser
• the error TypeError: Cannot read properties of undefined (reading: data) at AssociatedSegmentOverrides is no longer seen

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
docs	✅ Ready (Inspect)	Visit Preview		Nov 14, 2023 2:39pm
flagsmith-frontend-preview	✅ Ready (Inspect)	Visit Preview		Nov 14, 2023 2:39pm
flagsmith-frontend-staging	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Nov 14, 2023 2:39pm

[github-actions]

Uffizzi Preview deployment-40716 was deleted.

[sentry-io]

Suspect Issues

This pull request was deployed and Sentry observed the following issues:

• ‼️ TypeError: Cannot read properties of undefined (reading 'total_segment_overrides') <anonymous>(web/components/SegmentOverrides) View Issue
• ‼️ TypeError: Cannot read properties of undefined (reading 'total_segment_overrides') <anonymous>(web/components/modals/AssociatedSeg... View Issue

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