Add array return type to all hook_schema implementations

Seems straight forward and good cleanup.

Applied the diff an search getting one result, which is not a hook_schema.

$ grep --exclude-dir={assets,node_modules,vendor.phpstan=tmp} --exclude=\*.cspellcache --exclude=\*.yarn -r '^function.*_schema(' core | grep -v ": a
rray"
core/includes/update.inc:function _update_fix_missing_schema() {

But now the diff does not apply, the baseline needs to be updated.

Rebased and rebaselined

Rebase seems good.

Needs another rebase.

Rebased once more

quietone → closed merge request !9942

@mstrelan, thanks for the rebase.

Committed to 11.x and 11.1.x, Thanks!

Automatically closed - issue fixed for 2 weeks with no activity.