feat(RM-76): Allow blank status & add Custom & Competing status

[DanPlayz0]

This PR relies on a PR to TicketsBot-cloud/tickets.rs#1 for the custom status state property to be set per the discord docs.

This pull request introduces a new feature to allow users to delete their whitelabel bot status, expands the available status types, and updates the frontend to support these changes. The most important changes include adding a new API endpoint for deleting statuses, integrating this endpoint into the frontend, and adding new status types to the existing functionality.

Backend Changes:

• New API Endpoint for Deleting Whitelabel Bot Status: Added the WhitelabelStatusDelete function in app/http/endpoints/api/whitelabel/whitelabelstatusdelete.go to handle DELETE requests for removing a bot's status. This includes database updates and publishing status changes to the sharder.
• Route Registration: Registered the new DELETE /status route in StartServer to connect the endpoint to the server.

Status Type Enhancements:

• Additional Status Types: Added "Competing" and "Custom" as valid status types in WhitelabelStatusPost to expand the range of activities users can set.

Frontend Changes:

• Dropdown Options Update: Updated the Whitelabel.svelte dropdown to include "Competing" and "Custom" status options.
• Delete Status Button: Added a "Clear Status" button in Whitelabel.svelte that appears conditionally when a status is set.
• Delete Status Functionality: Implemented the deleteStatus function in Whitelabel.svelte to send DELETE requests to the new API endpoint and handle success or error notifications.