Disable Turbo for administrate forms

[jazairi]

Why these changes are being introduced:

In Rails 8, Turbo is enabled by default. This
causes a big with administrate form submissions
where validations don't fire, and the POST fails
silently.

Relevant ticket(s):

• ETD-691

How this addresses that need:

This adds the data-turbo=false attribute to the
body tag of our custom admin/application
layout, which disables Turbo in all administrate
views.

Side effects of this change:

We're not leveraging Turbo in administrate, but
I'm not sure it would add value anyway.

Developer

• All new ENV is documented in README
• All new ENV has been added to Heroku Pipeline, Staging and Prod
• ANDI or Wave has been run in accordance to
  our guide and
  all issues introduced by these changes have been resolved or opened as new
  issues (link to those issues in the Pull Request details above)
• Stakeholder approval has been confirmed (or is not needed)

Code Reviewer

• The commit message is clear and follows our guidelines
  (not just this pull request message)
• There are appropriate tests covering any new functionality
• The documentation has been updated or is unnecessary
• The changes have been verified
• New dependencies are appropriate or there were no changes

Requires database migrations?

NO

Includes new or updated dependencies?

NO

[coveralls]

coverage: 98.25%. remained the same — etd-691 into main

[JPrevost]

Do we want to disable in our main template too or have we tested that enough to be confident it all works?