6378/validate csv

[matzduniuk]

This PR addresses #6378

• Addresses the issue in full
• Addresses only certain aspects of the issue

Description

• Adds a new endpoint to the application controller.
• Adds a comprehensive validation method for the incoming bulk application CSV file to the bulk upload service.
• Add integration tests for CSV validation methods
• Adds a new S3 service method for retrieving a CSV file from a private S3 bucket

How Can This Be Tested/Reviewed?

Note

At the moment, testing of this branch is reduced to verifying the coverage of the included integration tests or by preparing a mock CSV file directly in the S3 bucket

Author Checklist:

• Added QA notes to the issue with applicable URLs
• Reviewed in a desktop view
• Reviewed in a mobile view
• Reviewed considering accessibility
• Added tests covering the changes
• Made corresponding changes to the documentation
• Ran yarn generate:client and/or created a migration when required

Review Process:

• Read and understand the issue
• Ensure the author has added QA notes
• Review the code itself from a style point of view
• Pull the changes down locally and test that the acceptance criteria is met
• Either (1) explicitly ask a clarifying question, (2) request changes, or (3) approve the PR, even if there are very small remaining changes, if you don't need to re-review after the updates

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