[Feature] Application Clearing Button Functionality

[jmsargent10]

• taking inspiration from this python script (which has been used in years prior), write functionality that moves the current applicant data to a new MongoDB collection when the clear applicant data button is pressed
  • this will require making a new .env variable for the connection string to test the functionality on the mock data collection (we do not want to mistakenly delete all data from this past year)
  • the collection that contains mock data is the hacker_applications collection in the ApplicantData database
  • the current python script only deletes the data in the collection and does not save it to a separate collection, but we want to make sure we save this data so we can look back to previous years to see applicants/HBP community
• the old collection should have it's data moved to a new collection called "applicant_data_currentyear" so the one without the year can be used for the new data for the upcoming year's hackathon. for testing, you can name the collection "hacker_application_currentyear" to reflect the same type of renaming that will be used for the real data collection