Fix filters for custom attributes

[joanagmaia]

Changes proposed ✍️

• Create a new field to handle multi-select filter with pre-existent options. Sort options alphabetically
• After bulk enrichment, fetch attributes to get the latest attributes and options
• For "multi-select" and "special" render the new filter component. For "multi-select" and "special" that do not have available options, do not render as a filter

Screenshots (front-end changes only)

Checklist ✅

• Label appropriately with Feature, Enhancement, or Bug.
• Tests are passing.
• New backend functionality has been unit-tested.
• Environment variables have been updated:
  • Local frontend configuration: frontend/.env.dist.local, frontend/.env.dist.composed.
  • Local backend: backend/.env.dist.local, backend/.env.dist.composed.
  • Configuration docs have been updated.
  • Team members only: update environment variables in override, staging and production env. files and trigger update config script.
• API documentation has been updated (if necessary) (see docs on API documentation).
• Quality standards are met.
• All changes have been tested in a staging site.
• All changes are working locally running crowd.dev's Docker local environment.

[joanreyero]

Looks good to me! 🚀