Reduce messaging to GitHub in Jenkins Pipeline

[TerrenceMcGuinness-NOAA]

Description

This PR updates the Jenkins Pipeline code with safeguards against the errors caused when Jenkins fails to authenticate with GitHub to message or update a label. This was achieved simply by:

• Reducing the number out messages sent to the GitHub PR
• Putting try blocks around most of the update label calls

Type of change

• Bug fix (fixes something broken)
  The Pipeline continued to to fail due short network connection issues
  when trying to authenticate the updates of GitHub labels.

Change characteristics

• Is this a breaking change (a change in existing functionality)? NO
• Does this change require a documentation update? NO

How has this been tested?

This was tested on Hera with a full run-through without interruptions without any errors.

Checklist

• Any dependent changes have been merged and published
• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• My changes generate no new warnings
• New and existing tests pass with my changes
• I have made corresponding changes to the documentation if necessary