Close button trait

[Gerych1984]

Q	A
Is bugfix?	❌
New feature?	✔️
Breaks BC?	✔️

Since last PR I forgot about Alert and Toast, which have a close button but no toggle, soAbstractCloseButton moved to CloseButtonTrait.

1. Offcanvas and Modal now extended from AbstractToggleWidget
2. Offcanvas, Modal, Alert and Toast now use CloseButtonTrait

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (5f6e579) 98.46% compared to head (0b56bf7) 98.61%. Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #130 +/- ## ============================================ + Coverage 98.46% 98.61% +0.15% + Complexity 497 493 -4 ============================================ Files 21 21 Lines 1692 1660 -32 ============================================ - Hits 1666 1637 -29 + Misses 26 23 -3 ```

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[what-the-diff[bot]]

PR Summary

• Simplification of Alert.php The Alert.php file was revised for a more streamlined approach. We introduced a new, efficient method for rendering content while also discarding some unnecessary methods and properties.

• Trait Introduction in AbstractCloseButtonWidget.php The class was transformed into trait and renamed from AbstractCloseButtonWidget.php to CloseButtonTrait.php. This was done to help increase code reusability across different files. Some methods have been updated and new methods have been added.

• Incorporation of CloseButtonTrait in Various Files The Modal.php, Offcanvas.php, and Toast.php files now utilize CloseButtonTrait. This, together with modifications in existing methods, simplifies their structure and makes them easier to maintain, removing unnecessary redundancies.

• Improvements in Testing The test files AlertTest.php, ModalTest.php, and ToastTest.php were overhauled to reflect all the changes made in the main files. These adjustments will ensure our tests are reliable and up-to-date with our current codebase.

In brief, this PR brings improvements in code maintainability, reusability, and testing.