Mountain CSV file doesn't contain precise data

[michael-hawker]

From comment on review here: #4206 (comment)

Describe the bug

Our DataGrid Mountain CSV file: https://github.com/CommunityToolkit/WindowsCommunityToolkit/blob/main/Microsoft.Toolkit.Uwp.SampleApp/Assets/mtns.csv

Doesn't contain all the precise dates. Would be good if we can fill in more month/dates for the list from https://en.wikipedia.org/wiki/List_of_first_ascents (though this list doesn't have them all and you have to watch out for the peaks with different summits like II vs III or I)

Nothing super important or urgent, but would be nice for completeness of the sample.

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