Continued work on campaigns and contributions

[codersquirrelbln]

Title: Continued work on campaigns and contributions

Description:

• Refactored the campaign creation and editing process to handle accepted currencies more consistently.
• Extracted the form for campaign creation into a partial for better reusability.
• Adjusted the handling of repository associations in campaign creation.
• Fixed various bugs related to form handling and syncing campaign data to the database.
• Improved background jobs for syncing repositories and added background task functionality.
• Updated tests to reflect changes in campaign creation and repository syncing.