chore(ModalLauncher): remove unused file

[andipaetzold]

Purpose of PR

This file is not imported anywhere. It's a duplication of https://github.com/contentful/forma-36/blob/main/packages/components/modal/src/ModalLauncher/ModalLauncher.tsx. From what I can see, it doesn't provide any value.

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

[changeset-bot[bot]]

⚠️ No Changeset found

Latest commit: ce758626c6696f8c7af0692db839db57f5ae77e6

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
forma-36	✅ Ready (Inspect)	Visit Preview	Jun 5, 2024 3:41pm

[github-actions[bot]]

size-limit report 📦

Path	Size	Loading time (3g)	Running time (snapdragon)	Total time
CommonJS	135.71 KB (0%)	2.8 s (0%)	94 ms (+25.62% 🔺)	2.9 s
Module	132.05 KB (0%)	2.7 s (0%)	113 ms (+50.23% 🔺)	2.8 s