feat: Add Google Sheets Integration (#735)

* added intro and surveySelect page

* added home page and  wrapper component

* added spreadsheet select

* added data write functionality and added integration schema model

* improved UX

* reworked UI

* added google sheet integration

* removed some unused code

* added user email

* UI tweaks

* fixed build issues and made added question to top of spreadsheets

* adds refreshSheets and added empty survey/spreadsheets text

* restored pnpm-lock

* added duplicate sheet warning

* move process.env to t3env

* move migration

* update docs link, add note to show that sheets integration is not configured

* Add simple docs page for google-sheets

* added session check

* restored pnpm-lock

* Merge branch 'main' of github.com:formbricks/formbricks into Integration/Google-sheet

* added google sheet  env variables to runtimeEnv

---------

Co-authored-by: Johannes <johannes@formbricks.com>
Co-authored-by: Matthias Nannt <mail@matthiasnannt.com>

apps/formbricks-com/components/docs/Navigation.tsx

@@ -229,6 +229,7 @@ export const navigation: Array<NavGroup> = [
       { title: "Zapier", href: "/docs/integrations/zapier" },
       { title: "n8n", href: "/docs/integrations/n8n" },
       { title: "Make.com", href: "/docs/integrations/make" },
+      { title: "Google Sheets", href: "/docs/integrations/google-sheets" },
     ],
   },
   {