Add theme-level global styles to Cart and Checkout block

[nielslange]

We're enabling the theme-level global styles in Cart and Checkout blocks.

This epic aims to ensure that both the Cart and the Checkout block fully support the theme-level and WCBlocks-level global styles in the editor and front end.

Theme Level Styles » Cart

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1. Use consistent and semantically correct HTML elements in the Cart and Checkout blocks #8976
   block: cart block: checkout type: enhancement type: refactor +4
   
2. Ensure Cart block supports the theme-level global styles for Typography » Headings #8711
   block: cart block: checkout focus: global styles type: enhancement +4
   
3. Ensure Cart block supports the theme-level global styles for Typography » Buttons #8712
   block: cart block: checkout focus: global styles type: enhancement +4
   
4. Ensure Cart block supports the theme-level global styles for Colors » Links #8750
   block: cart block: checkout focus: global styles type: enhancement +4
   
5. Ensure Cart block supports the theme-level global styles for Colors » Headings #8751
   block: cart focus: global styles type: enhancement +3
   
6. Ensure Cart block supports the theme-level global styles for Colors » Buttons #8713
   block: cart block: checkout focus: global styles type: enhancement +4
   
7. Ensure Cart block supports the theme-level global styles for Layout » Block spacing #8828
   block: cart focus: global styles type: enhancement +3
   
8. Some editor buttons of the Cart and Checkout blocks inherit the theme styling when they shouldn't #8571
   block: cart block: checkout focus: accessibility type: bug +4
   
9. Ensure Cart and Checkout blocks support the default theme-level global styles for Layout #8752
   block: cart block: checkout focus: global styles type: enhancement +4
   

Theme Level Styles » Checkout

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1. Use consistent and semantically correct HTML elements in the Cart and Checkout blocks #8976
   block: cart block: checkout type: enhancement type: refactor +4
   
2. Ensure Checkout block supports the theme-level global styles for Typography » Headings #8811
   block: checkout focus: global styles type: enhancement +3
   
3. Ensure Checkout block supports the theme-level global styles for Typography » Buttons #8810
   block: checkout focus: global styles type: enhancement +3
   
4. Ensure Checkout block supports the theme-level global styles for Colors » Links #8807
   block: checkout focus: global styles type: enhancement +3
   
5. Ensure Checkout block supports the theme-level global styles for Colors » Headings #8806
   block: checkout focus: global styles type: enhancement +3
   
6. Ensure Checkout block supports the theme-level global styles for Colors » Buttons #8808
   block: checkout focus: global styles type: enhancement +3
   
7. Ensure Checkout block supports the theme-level global styles for Layout » Block spacing #8826
   block: checkout focus: global styles type: enhancement +3
   
8. Some editor buttons of the Cart and Checkout blocks inherit the theme styling when they shouldn't #8571
   block: cart block: checkout focus: accessibility type: bug +4
   
9. Cross-Sells Products block: Replace Add to Cart block with Product Button block #8858
   block: cross-sells type: refactor +2
   
10. Ensure Cart and Checkout blocks support the default theme-level global styles for Layout #8752
    block: cart block: checkout focus: global styles type: enhancement +4
    

WC Block Level Styles » Cart

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1. Ensure Cart block supports the WCBlock-level global styles for Blocks » Product Title » Typography #8829
   block: cart focus: documentation focus: global styles +3
   
2. Ensure Cart block supports the WCBlock-level global styles for Blocks » Product Title » Layout #8830
   block: cart focus: global styles type: enhancement +3
   
3. Ensure Cart block supports the WCBlock-level global styles for Blocks » Product Title » Colors #8831
   block: cart focus: global styles type: enhancement +3
   
4. Ensure Checkout block supports the theme-level global styles for Blocks » Product image » layout #8827
   block: checkout focus: global styles type: enhancement +3
   

WC Block Level Styles » Checkout

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1. There are no tasks for WC Block Level Styles » Checkout.

[tarunvijwani]

We're using #8809 as the Base PR. All related PRs should be based on this branch to facilitate collective testing.