Add random 8 character hex string confirmation code to applications

[pbn4]

Pull Request Template

Issue

Addresses # (#1074)

• This change addresses the issue in full
• This change addresses only certain aspects of the issue
• This change is a dependency for another issue
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Description

Add random 8 character hex string confirmation code to applications. Existing applications confirmationCode addition is handled by a migration.

Type of change

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Prototype/POC (not to merge)
• This change is a refactor/address technical debt
• This change requires a documentation update
• This change requires a SQL Script

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Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have reviewed the changes in a desktop view
• I have reviewed the changes in a mobile view
• I have commented my code, particularly in hard-to-understand areas
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• I have run yarn generate:client if I made backend changes

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[seanmalbert]

@pbn4 ,
I think this look good, although if a use case comes up for using confirmation codes within the system I think we should enforce that it's accompanied by the listing or some other information like the applicants name, so we can know for sure that it's the right application.