* Apply focusLockService to TourStepDirective
Apply focusLockService to TourStepDirective in order to ensure that
non-modal page contents are inert and do not interfere with focus on
modal dialog with regards to screen reading technologies.
* Add properties to umb-tour.html.
Add properties to umb-tour html page to ensure that it aligns with modal
dialog best practices.
* Add dialog properties to Umbraco tour .html files.
Add properties relating to dialog and accessibility to the Umbraco tour
.html files, including aria-label, role, and tab index.
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