Split role::diamond  $labs_enabled_projects array

One entry per line will make it easier to review labs projects being
whitelisted for diamond collection.

Change-Id: I7525d4ddbf6ace5861743f3b8968ba10dae943c8
diamond: enable on labs project 'integration'

The 'integration' project has Jenkins CI slaves that we need to monitor
a bit to figure out potential network/cpu/IO bottlenecks.

Bug: 69748
Change-Id: I603d656ac735932b57e05f380a59f56e6e0efa76
Merge changes I603d656a,I7525d4dd into production

* changes:
  diamond: enable on labs project 'integration'
  Split role::diamond  $labs_enabled_projects array