fix(ui): Open mailto link in new tab

[jfrancos-mai]

Description:

Some Apple/Chrome users have Chrome set to handle mailto links by opening them in a specific webmail client (e.g. gmail). In this situation, when DataHub's "email" link is clicked, the current DataHub page is replaced with a gmail-compose page, which then disappears once the message is sent.

The fix here is adding target="_blank" to the anchor tag. I tried out this change and verified that behavior is what we'd want for both situations:

1. When Chrome is set to handle mailto links, they open in a new tab
2. When that's not the case, an external client is opened as usual, without opening an extra tab

Other browsers:

• Safari has this capability but only with installing an extension. I did not test this.
• Firefox ignores target="_blank" for mailto links. If we'd like to fix this for Firefox, we can do it in javascript with window.open but that's a rabbit hole. I don't think we should worry about it, considering its relative low
  usage, but happy to work on it if we think it's necessary.

To test this out:

1. Open Apple mail settings and set "Default email reader" to Google Chrome
2. Open up gmail in chrome, and click the double-diamonds on the right side of the address bar
3. If the double diamonds don't appear, remove mail.google.com from chrome://settings/handlers and reload the gmail page

Checklist

• The PR conforms to DataHub's Contributing Guideline (particularly Commit Message Format)
• Links to related issues (if applicable)
• Tests for the changes have been added/updated (if applicable)
• Docs related to the changes have been added/updated (if applicable). If a new feature has been added a Usage Guide has been added for the same.
• For any breaking change/potential downtime/deprecation/big changes an entry has been made in Updating DataHub

[chriscollins3456]

amazing thank you!