Update Text component styles
          #9353
        
          
      
                
     Merged
            
            
          
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Part of https://github.com/Shopify/polaris-summer-editions/issues/15
Important callouts:
heading4xlis mapped toheading3xlwhen the beta flag istrueheadingXsis mapped toheadingSmwhen the beta flag istruebodyXsis not being implemented in this iteration (if that changes we briefly discussed using the-experimentalprefix)Screen.Recording.2023-06-01.at.3.28.26.PM.mov