fix: name value can be undefined for existing name type fields

[hariombalhara]

What does this PR do?

Fixes booking page crash when a user has a legacy name type of field which was simply a text field. Now, name field is much more than that.

Type of change

• Bug fix (non-breaking change which fixes an issue)

How should this be tested?

• Add a "short text" user field. Go to DB and change it's type to 'name'(because name type can't be added from UI. User had it already as it was allowed earlier but wasn't useful)

• Now try booking the page and observe the crash.

Mandatory Tasks

• Make sure you have self-reviewed the code. A decent size PR without self-review might be rejected.

Checklist

• I haven't added tests that prove my fix is effective or that my feature works

Couple of findings

- I should really not have assumed that the value can't be `undefined` [here](https://github.com/calcom/cal.com/blob/5bb39dda3a81070b26c43665d6ed20d123638317/packages/features/form-builder/Components.tsx#L84).  TypeScript didn't catch it because we [do type assertions here.](https://github.com/calcom/cal.com/blob/5bb39dda3a81070b26c43665d6ed20d123638317/packages/features/form-builder/FormBuilderField.tsx#L211)
- I thought about the possibility of someone having a `name` type of field already but missed testing it out in the final PR. It could have been caught
- This bug doesn't affect anyone else that doesn't have a 'name' type of field added already.

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
api	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 21, 2023 3:10pm
cal-demo	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 21, 2023 3:10pm
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ui	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 21, 2023 3:10pm

1 Ignored Deployment

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cal	⬜️ Ignored (Inspect)			Jul 21, 2023 3:10pm

[github-actions]

Thank you for following the naming conventions! 🙏

[alwaysmeticulous]

🤖 Meticulous spotted visual differences in 82 of 207 screens tested: view and approve differences detected.

_{Last updated for commit ed8a4ae. This comment will update as new commits are pushed.}

[CarinaWolli]

Tested and works 👍

[github-actions]

📦 Next.js Bundle Analysis for @calcom/web

This analysis was generated by the Next.js Bundle Analysis action. 🤖

This PR introduced no changes to the JavaScript bundle! 🙌