DC-958: Add notification for snapshot ready

[pshapiro4broad]

Jira: https://broadworkbench.atlassian.net/browse/DC-1186

What:

Add a new notification message for the TDR snapshot ready event.

Why:

In Terra, Thurloe is used to send messages.

How:

The dependency on workbenchLibs was tested locally by using sbt publishLocal and using a pinned snapshot version; once the workbench-libs and terra-helmfile PRs are merged, I can merge this change up and test the notification support in dev.

See also

https://github.com/broadinstitute/terra-helmfile/pull/5783
broadinstitute/workbench-libs#1697

---

• Submitter: Make sure Swagger is updated if API changes
• Submitter: If updating admin endpoints, also update firecloud-admin-cli
• Submitter: Update FISMA documentation if changes to:
  • Authentication
  • Authorization
  • Encryption
  • Audit trails
• Submitter: If you're adding new libraries, sign us up to security updates for them

[rjohanek]

thanks for walking through this with me. the map here represents substitutions to be made in the body of the email. the empty maps here represent substitutions for a user's email and name. We get the first name for free from the user id, so we don't need that substitution and we don't use the email in the body of the email, so we don't need that substitution.

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 10 lines in your changes missing coverage. Please review.

Project coverage is 55.92%. Comparing base (f2aab0a) to head (cd3c7b4).
Report is 2 commits behind head on develop.

Files	Patch %	Lines
...ala/thurloe/notification/NotificationMonitor.scala	0.00%	10 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #301      +/-   ##
===========================================
- Coverage    59.69%   55.92%   -3.78%     
===========================================
  Files           14       17       +3     
  Lines          593      633      +40     
  Branches        53       69      +16     
===========================================
  Hits           354      354              
- Misses         239      279      +40     

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