As of now, link-tracking creates link tracking for every <a> tag, no matter the href attribute. This commit only creates link tracking for valid URLs.
The reason I wrote a new regex instead of rewriting linkTagRegex is that this regex is used by message-list.
https://regex101.com/r/jD5zC7/3 vs https://regex101.com/r/cK0zD8/2Resolves: #1525
Fix broken links in link tracking and read receipts
Fix bug in email frame where it wouldn't adjust the height even when
content changed
MessageItem bodies automatically clear the MessageBodyProcessor cache when
the message contents (including metadata) change.
Remove unused Account stuff from nylas-observables
Plugins appIds properly read if there's an environment set