fix(v2): fix render bug in delete field modal, misc builder improvements

[justynoh]

Problem

1. Delete field modal had a render bug (question numbers were not calculated correctly due to modal rendering on builder open rather than delete field button onClick). Also, trying to create fields crashes. oops.
2. Hide draggable icon when field is in creating state, closes [0.5] Draggable icon should not be displayed if field is in Creating state #4657
3. Rename statement to paragraph in Edit Paragraph drawer, closes Rename statement to paragraph #4751
4. Remove "Save field" footer from MyInfo edit drawers, closes Remove "Save field" footer from MyInfo fields edit drawer #4741
5. Do not retain create fields in mobile, closes [2] bug: Pressing close button on create field in mobile should discard the field instead of keeping field around #4729
6. Verify button should be displayed for verified fields in the builder, closes Display verification button for verified fields in the builder #4739

Solution

1. DeleteFieldModal, BuilderAndDesignTab modified to fix render bugs by rendering modal only when deleteFieldModalDisclosure is open.
2. FieldRowContainer now hides draggable icon
3. EditParagraph field name is now Paragraph
4. EditMyInfo only renders the drawer footer if creating, otherwise no footer is shown. Additionally, fixed a small bug with DrawerContentContainer which dividers to show in between null or undefined children (which was necessary in this case).
5. CreatePageSidebarContext > setActiveOrPendingTab always sets to inactive field if creation is cancelled, regardless of mobile or desktop.
6. Add VerifiedFieldBuilderContainer which wraps verified input fields with the builder button (which will be always disabled, as confirmed by @pearlyong). Use it in FieldRowContainer to wrap mobile and email fields if verified, a la FieldFactory.

Breaking Changes

• No - this PR is backwards compatible

[karrui]

lgtm