Add additional dates to "all domain request metadata"

[h-m-f-t]

Issue description

We're currently using "submitted date" to mean the last (or latest) time a request entered a submitted state, as there can be submission rounds. Let's add a few fields to domain requests and then update the CSV.

Acceptance criteria

• [x] Create 3 new fields in the Domain request object
  • [x] "First submitted date" - the first time the request entered Submitted (call it first_submitted_date in the code). Note you need to have this be set in the submit() function in domain_request
  • [x] "Last submitted date" – the latest time the request entered Submitted (this is really a rename of "submission_date" to be called last_submission_date). Check that the migration file says "rename" NOT altered field
  • [x] "Latest status update" – the date an analyst or admin last updated the Status. (Note on save you can check for status change on the request and update this field)
• [x] Add these fields to the "all domain request metadata" CSV (see additional context below)
• [x] Show these dates on the Domain Requests table (next to current "Submitted" date field)

Migrate data

• [x] Prepare a migration script to fill first_submitted_date and latest status update
• [x] ensure the migration script has instructions on how to run it in the data_migration.md
• [x] make a ticket for running this script on staging and another for stable.

Additional context

if you don't check that the migration says rename from submission_date to last_submission_date you will delete every submission date in our database. It NEEDS to say rename.

Note, for the migration script, you can use audit logs to get the status you need.

• The new order of the first few fields in the Domain request csvCSV should be
  • Domain request, First submitted date, Last submitted date [replaces the current Submitted date], Status, Latest status update...
• In situations where an analyst puts a request into Submitted (uncommon), the Latest status update will be the same as the Last submitted date. That's ok.

Talked about in this Slack thread.

Links to other issues

• 🔄 Similar to #2166
• 🙅 Replaces #2418

[abroddrick]

@h-m-f-t only one question on this now that I look at it. Do you want these fields showing on the Domain Request page for individual requests or on the Domain Request table shown to analyst in admin?

[h-m-f-t]

@abroddrick Good question! I could go either way on this. For now, let's add all the dates to both the individual request page and on the table inside Domain requests.

[h-m-f-t]

Added refinement to make sure the A/C's capture that last 2 comments...