Prevent fetched object double wrapping

[bbrands02]

prevents
[[object]]

when dealing with a single fetched object

[WilcoLouwerse]

Nice fix for the double-wrapping issue — array_is_list() is the right guard here.

Two things I noticed:

1. Indentation mismatch
The new blocks at both locations use tabs where the surrounding code uses spaces. Visible in the diff — the if block around line 632 and the replacement around line 1949 are tab-indented inside space-indented context. Worth fixing before merge.

2. Wrapping logic split across two methods
The call chain is synchronizeExternToIntern → getAllObjectsFromSource → getAllObjectsFromApi. With this change, the _object wrapping is skipped in getAllObjectsFromApi and handled by the caller instead. That works, but it means anyone calling getAllObjectsFromApi directly won't get the normalization for _object results.

Would it be cleaner to keep all the normalization in getAllObjectsFromApi — i.e., do the array_is_list() check there for all resultsPosition values, including _object — so it always returns a proper list regardless of who calls it?

[WilcoLouwerse]

Note: all 6 failing CI jobs are unrelated to this PR.

• PHPCS, PHPStan, PHPMD, Psalm, PHPUnit — runner has PHP 8.1.34 but composer requires >= 8.3. Looks like a missing setup-php step in the workflow.
• Frontend Quality — transient ECONNRESET during npm install.

These fail on main too.