[Cloud Func] Change send email for the new monorepo nightly build trigger

[lina128]

and also add success notification.

Note: The function is manually changed and tested in gcp's UI and is working well. This PR is to keep the function in sync.

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This change is 

[dsmilkov]

Reviewable status: complete! 1 of 1 approvals obtained (waiting on @dsmilkov and @lina128)

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tfjs-core/scripts/cloud_funcs/send_email/index.js, line 34 at r1 (raw file):

  const build = JSON.parse(new Buffer(event.data, 'base64').toString());
  // Also added 'SUCCESS' to monitor successful builds.
  const status = [

we decided to ignore successful nightly builds since they are not actionable and help reduce email clutter. WDYT?

[lina128]

Reviewable status: complete! 1 of 1 approvals obtained (waiting on @dsmilkov and @lina128)

tfjs-core/scripts/cloud_funcs/send_email/index.js, line 34 at r1 (raw file):

  const build = JSON.parse(new Buffer(event.data, 'base64').toString());
  // Also added 'SUCCESS' to monitor successful builds.
  const status = [

we decided to ignore successful nightly builds since they are not actionable and help reduce email clutter. WDYT?

Ping asked to add the success case so that at least we receive the notification daily, otherwise we don't know if the notification itself is working. Personally, I don't have a strong opinion on either idea. Both sounds reasonable :)

[dsmilkov]

That makes sense too. LGTM . We can setup email filters