CORE-69: scala steward config

[davidangb]

Jira: https://broadworkbench.atlassian.net/browse/CORE-69

Updates the Scala Steward config file. Note that the current config has a mistake and is not currently in use. For instance, see #349 and notice the "Note that the Scala Steward config file .scala-steward.conf wasn't parsed correctly" message in the PR description.

Changes to config:

• limit to 5 PRs per Scala Steward run
• move to "on-conflicts" mode for updating PRs
• prefix PR titles with "CORE-69:"
• fix the cron expression. This is the part that was causing parsing to fail. Since parsing was failing, Scala Steward was defaulting to "@asap" and I am changing that to weekly.
• add grouping of minor/patch updates
• add labels

---

• 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

[marctalbott]

What do you think about batching the minor and patch updates too like we're doing in Rawls?

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 59.71%. Comparing base (192bece) to head (a01ce5a).
Report is 1 commits behind head on develop.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #353   +/-   ##
========================================
  Coverage    59.71%   59.71%           
========================================
  Files           18       18           
  Lines          638      638           
  Branches        66       66           
========================================
  Hits           381      381           
  Misses         257      257           

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[davidangb]

What do you think about batching the minor and patch updates too like we're doing in Rawls?

@marctalbott added in e048e83!