chore: Drop BOPS_SUBMISSION_URL_* env vars in favour of DB values

[DafyddLlyr]

Take two for this PR - #2504

It looks like I merged this to a parent branch which was already merged to main so this never got picked up 🤦‍♂️

I'll rebase this now 👍

What does this PR do?

• Drop BOPS_SUBMISSION_URL_* env vars
• Drop BOPS_API_ROOT_DOMAIN env vars
• Read these values from the DB instead

Why?

• Medway require their BOPS env added to PlanX and it now seems like a perfect time to tidy this up a little!

Depends on theopensystemslab/planx-core#212

Before merging this I'd be grateful for another pair of eyes on db values now populated on prod and staging. This query is giving me the expected results -

query GetBopsSubmissionURLs {
  teams(where: {integrations: {team_id: {_is_null: false}}}) {
    slug
    integrations {
      production_bops_submission_url
      staging_bops_submission_url
    }
  }
}

Once merged I'll also remove these from the real .env files on S3 also 👌

[github-actions]

Removed vultr server and associated DNS entries

[DafyddLlyr]

This is ready for (re) review! The only changes from the previous PR are updates to test in this commit.

[jessicamcinchak]

Thanks for catching this merge bug - happy for this to move forward, a very nice tidy up!