Bad tenant url on tenant creation

[epipav]

Changes proposed ✍️

• On tenant create, we were setting the tenant.url as a random uuid when the data payload didn't have the url field. Now we're generating a tenant url from the tenant name and checking for duplication problems as well since url needs to be unique
• The previous uuid approach was creating a problem when publishing community help center of a tenant (The url comes populated with uuids)
• Also refactored out getCleanString function to utils, to also use it in tenantRepository

Checklist ✅

• Label appropriately with type:feature 🚀, type:enhancement ✨, type:bug 🐞, or type:documentation 📜.
• Tests are passing.
• New backend functionality has been unit-tested.
• Environment variables have been updated
  • Front-end: frontend/.env.dist
  • Backend: backend/.env.dist, backend/.env.dist.staging, backend/.env.dist.staging.
  • Configuration docs have been updated.
  • Team members only: update environment variables in Password manager and update the team
• 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.

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[epipav]

@joanreyero after merge we'll need to update the tenant urls of prod tenants that have uuid in them