fix americas test kitchen import "tool" prop parsing

[saywebsolutions]

Topic and Scope

Fix 2523 - allow recipes to imported from americastestkitchen.com.

Concerns/issues

Some additional improvements may also be helpful on the frontend in order to display the tool prop when it's an array.

Formal requirements

There are some formal requirements that should be satisfied. Please mark those by checking the corresponding box.

• I did check that the app can still be opened and does not throw any browser logs
• I created tests for newly added PHP code (check this if no PHP changes were made)
• I updated the OpenAPI specs and added an entry to the API changelog (check if API was not modified)
• I notified the matrix channel if I introduced an API change

[github-actions]

Test Results

   12 files    588 suites   1m 56s ⏱️
  577 tests   577 ✅ 0 💤 0 ❌
2 308 runs  2 307 ✅ 1 💤 0 ❌

Results for commit 845e134.