ui/lists: use component type for create dialogs

[tony-tvu]

• Identified the issue which this PR solves.
• Read the CONTRIBUTING document.
• Code builds clean without any errors or warnings.
• Added appropriate tests for any new functionality.
• All new and existing tests passed.
• Added comments in the code, where necessary.
• Ran make check to catch common errors. Fixed any that came up.

Description:
This PR makes SimpleListPage take in a component as a prop, instead of a ReactElement, in order to make the onClose prop required for our Dialog components. Because PolicyCreateDialog and ServiceCreateDialog were still in javascript, I was running into type mismatch errors since their top-level return types were undefined, so I converted the files to typescript and gave them return types to resolve this.

Which issue(s) this PR fixes:
#2458

Out of Scope:

• PolicyCreateDialog.js and ServiceCreateDialog.js were converted to typescript. (Related issue: ui: convert javascript files to typescript #2318)
• The onClose prop is made required for ScheduleCreateDialog, ScheduleDeleteDialog, and ScheduleOverrideCreateDialog.

[stale]

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