Chainable methods fix

[mringler]

Issue

Methods Model::setPrimaryKey()/Model::setPrimaryKeys() return void and are not chainable, even though everything else is.

Changes

Methods return $this now. This made some Spryker sniffs complain, so I removed them.
Also, the script rebuilding reference files had to be adjusted for phpunit 10.

Implementation Details

First removed sniff required methods with @return $this to explicitly do return $this;. Returning $this through another method (i.e. return $this->returnThis();) caused an error. This leads to unnecessarily elongated methods , and overall is something type checkers should handle, not linters.
I remembered previously changing types from @return $this to @return static because of this rule. I went back and adjusted those, now that the "correct" type can be used.

Second removed sniff failed to recognize the array in @param array{int, string}:

Possible doc block error: array{int, string} $keys seems to be missing type array. (Spryker.Commenting.DocBlockParamAllowDefaultValue.Typehint)

Having array shapes seems more beneficial than what the rule checks, and I think this kind of error is detected by type checkers.

Test strategy

Via reference file and lint/stan.