SelectField: extend to accept more data structures as children and to fix placeholder

[vmilan]

Description

Shortcut: https://app.shortcut.com/cartoteam/story/352074/cn-replace-old-code-with-selectfield-component
[sc-352074]

[shortcut-integration]

This pull request has been linked to Shortcut Story #352074: CN - Replace old code with SelectField component.

[github-actions]

Pull Request Test Coverage Report for Build 7396927713

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 69.205%

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Totals
Change from base Build 7385908140:	0.0%
Covered Lines:	2609
Relevant Lines:	3446

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💛 - Coveralls

[github-actions]

Visit the preview URL for this PR (updated for commit 0283cb5):

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[zbigg]

MultipleSelect seems to have excessive padding and extra colon at end (old bug)

[zbigg]

(old bug) Multiple Select Field with size='medium' has same height as small, only text changes:

[VictorVelarde]

Code changes LGTM. Do we have Design check over storybook?

PD. Let's be a bit more verbose about the new 'supported use cases', at least in CHANGELOG

[vmilan]

Code changes LGTM. Do we have Design check over storybook?

PD. Let's be a bit more verbose about the new 'supported use cases', at least in CHANGELOG

No, since they are going to review in the dedicated, I didn't want to overwhelm them with several reviews of the same thing.

Changed changelog and PR title.

[vmilan]

MultipleSelect seems to have excessive padding and extra colon at end (old bug)

After our conversation, I decided not to export Multiple SelectField for now until we solve these errors and improve the component, hopefully next Q.