Add notification channel for build pipeline

[randomanderson]

Description

This PR adds a channel for notifications for pipeline failures. The shared pipeline has added notifications for failures during a release pipeline. More notifications may be added in the future.

Reviewer checklist

• Test coverage seems ok.
• Appropriate labels assigned.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 74.83%. Comparing base (15ce2b9) to head (1bb5c28).

Additional details and impacted files

@@            Coverage Diff            @@
##             master    #3108   +/-   ##
=========================================
  Coverage     74.83%   74.83%           
  Complexity     2792     2792           
=========================================
  Files           113      113           
  Lines         11069    11069           
=========================================
  Hits           8284     8284           
  Misses         2785     2785           

Flag	Coverage Δ
tracer-php	74.83% <ø> (ø)

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