app: add gimp_action_history_is_blacklisted_action()
... and rename gimp_action_history_excluded_action() to gimp_action_history_is_excluded_action(). is_blacklisted_action() determines whether an action should be excluded from *both* the history and the search results, while is_excluded_action() determines if an action should be excluded only from the history. This eliminates some redundancy across gimpaction-history and action-search-dialog.
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