fix: modified google sheet integration and minor refactors in other integrations

[Dhruwang]

What does this PR do?

1. Originally, within the Google Sheets integration, users were presented with a selection of accessible spreadsheets. This process also required access to the sensitive "drive" scope. However, in alignment with the new user experience (UX), individuals are now prompted to input the URL of their spreadsheet to establish the Google Sheet link.
2. Across Google Sheets, Airtable, Slack, and Notion integrations, we employed the Connect.tsx component uniformly. Consequently, we developed a reusable component for this purpose within the packages/ui directory.
3. Various minor refinements.

Screen-Recording-2024-05-03-at-3.04.04.PM.mp4

Fixes https://github.com/formbricks/internal/issues/132

How should this be tested?

Test google sheet integraton

Checklist

Required

• Filled out the "How to test" section in this PR
• Read How we Code at Formbricks
• Self-reviewed my own code
• Commented on my code in hard-to-understand bits
• Ran pnpm build
• Checked for warnings, there are none
• Removed all console.logs
• Merged the latest changes from main onto my branch with git pull origin main
• My changes don't cause any responsiveness issues
• First PR at Formbricks? Please sign the CLA! Without it we wont be able to merge it 🙏

Appreciated

• If a UI change was made: Added a screen recording or screenshots to this PR
• Updated the Formbricks Docs if changes were necessary

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[github-actions]

Thank you for following the naming conventions for pull request titles! 🙏

[mattinannt]

@Dhruwang sorry for the late review :-) Code looks great :-) There are only two small questions I added below.
Also can you please check the docs page ( https://formbricks.com/docs/self-hosting/integrations#google-sheets ) if changes needs to be made here? :-)

[mattinannt]

@Dhruwang thanks for making the changes :-) :-) Let's merge this!