Add button platform to the Lektrico integration (#125897)
* Add lektrico buttons.
* Add DeviceClass.RESTART, remove exception, update description.
* Remove translation_key=reboot.
* Add button in strings.json.
* Fix button test with new snapshot.
* Remove remove button from strings.json.
* Delete all snapshots.
* Add new snapshots.
* Update tests/components/lektrico/snapshots/test_button.ambr
* Update tests/components/lektrico/snapshots/test_button.ambr
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Co-authored-by: Joost Lekkerkerker <joostlek@outlook.com>
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