Remove letter-jobs api

When we first built letters you could only send them via a CSV upload, initially we needed a way to send those files to dvla per job.
We since stopped using this page. So let's delete it!

app/letters/rest.py

@@ -1,35 +1,16 @@
 from flask import Blueprint, jsonify
 from flask import request
 
-from app import notify_celery
 from app.celery.tasks import process_returned_letters_list
-from app.config import QueueNames, TaskNames
-from app.dao.jobs_dao import dao_get_all_letter_jobs
-from app.schemas import job_schema
-from app.v2.errors import register_errors
-from app.letters.letter_schemas import letter_job_ids, letter_references
+from app.config import QueueNames
+from app.letters.letter_schemas import letter_references
 from app.schema_validation import validate
+from app.v2.errors import register_errors
 
 letter_job = Blueprint("letter-job", __name__)
 register_errors(letter_job)
 
 
-@letter_job.route('/send-letter-jobs', methods=['POST'])
-def send_letter_jobs():
-    job_ids = validate(request.get_json(), letter_job_ids)
-    notify_celery.send_task(name=TaskNames.DVLA_JOBS, args=(job_ids['job_ids'],), queue=QueueNames.PROCESS_FTP)
-
-    return jsonify(data={"response": "Task created to send files to DVLA"}), 201
-
-
-@letter_job.route('/letter-jobs', methods=['GET'])
-def get_letter_jobs():
-    letter_jobs = dao_get_all_letter_jobs()
-    data = job_schema.dump(letter_jobs, many=True).data
-
-    return jsonify(data=data), 200
-
-
 @letter_job.route('/letters/returned', methods=['POST'])
 def create_process_returned_letters_job():
     references = validate(request.get_json(), letter_references)