Mail: Remove angle brackets from password reset URL in emails sent by...

Mail: Remove angle brackets from password reset URL in emails sent by `retrieve_password()` and `wp_new_user_notification()`.

The brackets were originally added in [16285] per W3C recommendation in https://www.w3.org/Addressing/URL/5.1_Wrappers.html to avoid wrapping the URL across multiple lines in plain text in older email clients.

This doesn't seem like a common issue in modern email clients, and the current implementation causes more issues than it solves. Since the URL is on a line by itself, it should not require any delimiters.

The URL in recovery mode email introduced in [44973] doesn't have angle brackets, so it's time to retire them in password reset email too if they're not used consistently.

Props donmhico, Otto42, sproutchris, iandunn, dd32, DaveWP196, sebastian.pisula, tommix, sablednah, julian.kimmig, Rahe, clayisland, arenddeboer, nicole2292, nagoke, squarecandy, eatingrules, SergeyBiryukov.
Fixes #21095, #23578, #44589.
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git-svn-id: https://core.svn.wordpress.org/trunk@46886 1a063a9b-81f0-0310-95a4-ce76da25c4cd