[Notifier] Check for maximum number of buttons in slack action block #39300
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After having problems with the SlackSectionBlock (#39236) i thought it would be helpful to also have a check for the maximum elements in the SlackActionsBlock and a test. https://api.slack.com/reference/block-kit/blocks#actions
Edit: The actual documentation says that the maximum are 5 elements but this is outdated. The actual number is 25. The slack support confirmed that.
Can this be added to 5.2 or better to the 5.x branch?
There are also some other implementations of slack blocks like the SlackDividerBlock but they have only a constructor and no additional methods. Should we also add some tests for them even if they have no extra logic?