add excel exporter to admin stats page

[crystaltine]

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[ganning127]

@crystaltine Really nice start. Just a comment:

• I recently merged a PR that allows for filtering the statistics page based on branch and status. Would you be able to make the excel export reflect the filtering? The filtering logic and data handling is done, so it should just be a case of moving the export code to the correct location.

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[crystaltine]

@ganning127 The exporter already uses the current filtered dataset to generate the spreadsheet - is that what you were looking for? lmk if you meant something else - i just made a merge commit and some slight improvements.