VACMS-7582: Updates Tugboat, Lando, and DDEV to use PHP 7.4.

[ndouglas]

Description

Closes #7582.

I've tested Lando, DDEV, and Tugboat separately with PHP 7.4, but not with the contents of this specific PR. I'll do some more of that this afternoon.

Testing done

Screenshots

QA steps

As user uid with user_role

1. Do this
2. Then that
3. Then validate Acceptance Criteria from issue

• This
• That
• The other thing

Definition of Done

• Documentation has been updated, if applicable.
• Tests have been added if necessary.
• Automated tests have passed.
• Code Quality Tests have passed.
• Acceptance Criteria in related issue are met.
• Manual Code Review Approved.

Select Team for PR review

• Platform CMS team
• Sitewide CMS Team
  • ⭐️ Content ops
  • ⭐️ CMS Experience
  • ⭐️ Offices
  • ⭐️ Product Support

Is this PR blocked by another PR?

• DO NOT MERGE

Does this PR need review from a Product Owner

• Needs PO review

CMS user-facing annoucement

Is an announcement needed to let editors know of this change?

• Yes, and it's written in issue ____ and queued for publication.
  • Merge and ping @ rachel-kauff so she's ready to publish after deployment
• Yes, but it hasn't yet been written
  • Don't merge yet -- ping @ rachel-kauff to prompt her to write and queue content
• No announcement is needed for this code change.
  • Merge & carry on unburdened by announcements

[ndouglas]

@indytechcook Thoughts about merging this, considering that the actual upgrade for BRD to PHP 7.4 will be delayed?

[indytechcook]

@indytechcook Thoughts about merging this, considering that the actual upgrade for BRD to PHP 7.4 will be delayed?

I like the idea of php7.4 running locally for a bit before putting it on BRD.