Add proxy location to task form advanced settings

[wintonzheng]

[!IMPORTANT] Adds ProxySelector component for proxy location selection in task forms and updates related schemas and forms.

• Feature Addition:
  • Adds ProxySelector component in ProxySelector.tsx for selecting proxy locations.
  • Integrates ProxySelector into CreateNewTaskForm.tsx, SavedTaskForm.tsx, and RunWorkflowForm.tsx.
• Form Changes:
  • Adds proxyLocation field to task forms in CreateNewTaskForm.tsx, SavedTaskForm.tsx, and RetryTask.tsx.
  • Updates default values and form schemas in taskFormTypes.ts to include proxyLocation.
• Schema and Validation:
  • Updates createNewTaskFormSchemaBase and savedTaskFormSchemaBase in taskFormTypes.ts to include proxyLocation as a ProxyLocation enum.
• Miscellaneous:
  • Refactors existing proxy selection logic in RunWorkflowForm.tsx to use ProxySelector.

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