feat: Hidden fields and metadata for integrations

[Dhruwang]

What does this PR do?

Fixes https://github.com/formbricks/internal/issues/130

Adds hidden fields and metadata to following integrations

• Google sheet
• slack
• Airtable
• Notion

How should this be tested?

Open integration modal, check Include Hidden Fields and Includes Metadata

Checklist

Required

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

Appreciated

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

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2 Ignored Deployments

| Name | Status | Preview | Comments | Updated (UTC) | | :--- | :----- | :------ | :------- | :------ | | **formbricks-cloud** | ⬜️ Ignored ([Inspect](https://vercel.com/formbricks/formbricks-cloud/G6Ryy3Cg9iWXvNaCwUQyQk1RRtpL)) | [Visit Preview](https://formbricks-cloud-git-hidden-fields-and-metada-69295d-formbricks.vercel.app) | | Jun 13, 2024 9:12am | | **formbricks-docs** | ⬜️ Ignored ([Inspect](https://vercel.com/formbricks/formbricks-docs/FuiTxh4h3NF8ieb2hcPdyxJoq3KB)) | [Visit Preview](https://formbricks-docs-git-hidden-fields-and-metadat-36080b-formbricks.vercel.app) | | Jun 13, 2024 9:12am |

[github-actions[bot]]

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

[jobenjada]

Hey @Dhruwang

thanks for your good work, this has been requested several times now :)

Thanks for the screenshots in the PR description 🙌

Here are the open To Dos:

1. Please also open a PR in the landing page repo with an update to the docs pages, where needed
2. I ran into this error which seems unrelated but maybe you have an idea:

It happened when I clickend on "Create custom action" as a survey trigger for an app survey.

🚨 Note: I did not set up all the integrations locally to test it through. The webhook contains the additional information and I suppose testing it on prod once it's live is the more efficient way.

Thanks! :)

[gupta-piyush19]

@Dhruwang thanks for the fixes. LGTM 🚀