Implement data attributes on Carousel Header

Context:

Implement a set of new data attributes on the Carousel Header Block with standard values. These will be used later to trigger events and define its category, action and label. 

Here's a screenshot linking the elements with the data-ga-action standard value (this should be the same for all block styles): 

  
 More Information:

To view all events standards and data-attributes structure proposed: "P4 Events Standards - 2020 Review"  

Next steps:

1) Julia should create the Google Tag Manager setup in all P4-NRO's containers.  

Task: 

• Implement data-attributes on elements:
  • data-ga-category
  • data-ga-action
  • data-ga-label 
• Implement data-attributes with the following standard values

 Obs: The slide number should start at 1. The data-ga-label should be "Slide 1", "Slide 2", etc.