Reparse Model Field Additions

[elipe17]

Description:
As a follow on to #3064 it would be nice to have a few more fields added to the meta model. Adding a "time_completed" datetime field will be useful to know how long the event took to reparse all files. Also, tracking cat4 errors before and after the reparse will be helpful to help admins justify when the the "num records deleted" and the "num records created" diverge. We might also consider tying individual counts of cat4 errors to each file as opposed an aggregate for all files.

Acceptance Criteria:
Create a list of functional outcomes that must be achieved to complete this issue

• ReparseMeta model as new "finished_at" datetime field and cat4 tracking field
• Testing Checklist has been run and all tests pass
• README is updated, if necessary

Tasks:
Create a list of granular, specific work items that must be completed to deliver the desired outcomes of this issue

• Custom migration is written to populate existing ReparseMeta models with valid values. The new "finished_at" field should be populated with the existing timeout_at field. The cat4 count field should be added based on what is implemented.
• Add new fields to model
• Add logic to set fields when reparsing
• Write custom migration
• Test custom migration
• Test fields are updated when reparsing
• Run Testing Checklist and confirm all tests pass

Notes:
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Supporting Documentation:
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Open Questions:
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• Open Question 2