fix(material/datepicker): adds comparison ids and aria-describedby spans #30040
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Updates Angular Components Datepicker calendar-body .ts and .html files to add id values for if there is a comparison start/end date and to provide values to their respective html values to provide an aria-describedby value to be announced for screenreaders when comparison dates are present.
Before screenshot button no aria-describedby
Before screenshot no comparison date spans
Before fix screencast
After screenshot button aria-describedby
After screenshot span with respective aria-describedby id
After fix screencast
Fixes b/195600299