🔨 Switch SelectSandboxModal to use useOvermind

[MichaelDeBoey]

Follow-up of #2743 & #2816

Things I did extra:

• Change newSandboxShowcaseSelected's signature to accept a string instead of { id: string }, because it only has 1 argument
• Put all styles into the elements.ts file
• Make Sandbox a FunctionComponent
• Move overmind subscriptions as close as possible to the components itself instead of passing it through
• Make alias an optional argument of getSandboxName

[lbogdan]

Build for latest commit 6692d16 is at https://pr3071.build.csb.dev/s/new.

[christianalfoni]

It looks great, though there is a bug here (also in production). We need to close the modal as suggested. If you merge this in, it is ready 😄

Tested:

• Open profile
• Open select sandbox modal
• Change sandbox
• Refresh

(Suggested change must be merged first)

[christianalfoni]

Amazeballs 👍 😄

Double checked that you can select a new sandbox, and modal also closes, as it should

[MichaelDeBoey]

Always a pleasure 🙂