Allow a custom title for close button to be provided to Dialogs

[acelaya]

This will help address an issue found during the last accessibility review:

When buttons perform common actions such as closing a dialog, specificity of the label can be helpful for additional context.

Recommendation for close label:
Instead of “close”, consider using the label “close URL dialog”.

This PR introduces a new closeTitle prop in dialogs, which will propagate as the title prop for nested close buttons.

Currently, these are always rendered as "Close", which is not specific enough.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (ff02e25) 100.00% compared to head (9f1519b) 100.00%.

Additional details and impacted files

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  Coverage   100.00%   100.00%           
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  Files           60        60           
  Lines          936       936           
  Branches       353       353           
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  Hits           936       936           

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