fix(alerting): Add missing support for default-alert on teams-workflows

[liamjones-pw]

Summary

I noticed some weird behaviour where I wasn't getting alert resolved notifications through the new teams-workflows provider, while other alerting providers were working with the same config.

I went spelunking and while doing so, noticed teams-workflows was missing from the configuredProviders list at startup, even though it was sending alerts. This led me on the path to making the changes in the PR, which seem to have resolved the default-alerts issue.

Example config where aws-ses was working, while teams-workflow was not.

alerting:
  teams-workflows:
    webhook-url: "xxx"
    default-alert:
      description: "healthcheck failed 3 times in a row"
      send-on-resolved: true
  aws-ses:
    region: "xxx"
    from: "xxx"
    to: "xxx"
    default-alert:
      description: "healthcheck failed 3 times in a row"
      send-on-resolved: true

app-default: &app-default
  group: "apps"
  interval: "30s"
  conditions:
    - "[STATUS] == 200"
  alerts:
    - type: aws-ses
    - type: teams-workflows

endpoints:
  - name: "teams test"
    <<: *app-default
    url: "https://microsoftzzzzzzz.com"

Checklist

• Tested and/or added tests to validate that the changes work as intended, if applicable.
• Updated documentation in README.md, if applicable.

[TwiN]

Good catch!

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.59%. Comparing base (ff4b09d) to head (3b9ba46).
Report is 1 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #883      +/-   ##
==========================================
- Coverage   79.35%   77.59%   -1.76%     
==========================================
  Files          72       72              
  Lines        4853     5775     +922     
==========================================
+ Hits         3851     4481     +630     
- Misses        786     1078     +292     
  Partials      216      216              

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