[TASK] Add Stringable interface for various button components

This change implements __toString() in various
Toolbar Buttons, so it can be used
in various templates and controllers and is now compatible
with \Stringable. Custom Buttons can implement Stringable for
v12.0 only, and will still be compatible with v11+12

Resolves: #99804
Releases: main
Change-Id: I55c226058284f0af01f5086ffee4c0d3b178474d
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/77674


Tested-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Andreas Fernandez <a.fernandez@scripting-base.de>
Reviewed-by: Benjamin Kott <benjamin.kott@outlook.com>
Tested-by: core-ci <typo3@b13.com>
Tested-by: Benjamin Kott <benjamin.kott@outlook.com>