Validate CSV files pre-flight

[terrazoon]

If the header column is not on run one, delete blank lines until it is.

If the number of columns in the rows don't match the number of columns in the header, reject the file.

If there is a BOM present in a csv file, remove it before uploading to S3. Use lstrip('\ufeff')

[terrazoon]

There is a report that a user was able to upload a csv file that contained strings instead of phone numbers and that this file was accepted and we tried to process it, resulting all the messages failing.

I tried to repro with a simple CSV file with the same problem, but when I tried to upload it was rejected in the UI with the message "You need to fix 1 phone number".

We need the service_id and job_id to investigate further, so we can download the user's csv file.