Create accredited_individuals_accredited_organizations table

[holdenhinkle]

References department-of-veterans-affairs/va.gov-team#80656

The following PRs must be merged first:

• Create accredited_individuals table #16295
• Create accredited_organizations table #16296

Summary

This PR creates the following new table:

• accredited_individuals_accredited_organizations

Related issue(s)

• Recreate rep and org tables (and do some cleanup) va.gov-team#80656
• Create new reps, orgs, and org_reps tables va.gov-team#78731

Testing done

• NA

Screenshots

Note: Optional

What areas of the site does it impact?

The database
The schema.rb file

Acceptance criteria

• I fixed|updated|added unit tests and integration tests for each feature (if applicable).
• No error nor warning in the console.
• Events are being sent to the appropriate logging solution
• Documentation has been updated (link to documentation)
• No sensitive information (i.e. PII/credentials/internal URLs/etc.) is captured in logging, hardcoded, or specs
• Feature/bug has a monitor built into Datadog or Grafana (if applicable)
• If app impacted requires authentication, did you login to a local build and verify all authenticated routes work as expected
• I added a screenshot of the developed feature

Requested Feedback

(OPTIONAL)What should the reviewers know in addition to the above. Is there anything specific you wish the reviewer to assist with. Do you have any concerns with this PR, why?