## Description
The ImportUsersModal takes in a CSV file expecting each line to have a valid email address. When this file is created in Microsoft Excel, Windows in general, or a text editor that uses the carriage return character `\r`, the import fails. This is because the CSV string is split into an email list by `csvString.split("\n")` which fails to account for `\r\n` newlines. This PR changes the split to be the regex `/\r?\n/` which will split on either `\n` or `\r\n`.
Addresses:
- Issue #7398
- Discussion #7397
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