IBX-8470: Upgraded codebase to Symfony 6 #7
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Caution
This is a part of bigger set of changes, to be merged together when ready
Related PRs:
Description:
This PR bumps Symfony to v6 and improves codebase. I've added strict types to consts and missing return type(s) and I've also fixed PHPStan-specific data types type-hints to include phpstan- prefix as those are not recognized by phpDocumentor and sometimes IDE.
Except for static analysis, it's hard to say if the code works because there's 0 test coverage here. Browser tests for now will fail, until all packages are upgraded.
Key changes:
QA:
Sanities in the form of regression tests.
Documentation:
No documentation required.