Use constructor property promotion in module Theme

[leonhelmus]

Description (*)

Replace allmost all properties with constructor property promotion in module Theme: https://stitcher.io/blog/constructor-promotion-in-php-8

• Readable code
• Make Magento less complex by removing properties which take up a lot of lines.
• Imported all classes to make code more readable.

I think the code would be a lot cleaner if all modules start using constructor promotions, since of 2.4.6 php 7.4 is dropped we can now make use of it. So let's start on it right now :).

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes magento/magento2#<issue_number>

Manual testing scenarios (*)

1. ...
2. ...

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

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[leonhelmus]

@magento run all tests

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