feat: add processor to send notifications to ms teams

[drodil]

Hey, I just made a Pull Request!

A new processor that can be used to send notifications to Microsoft Teams webhooks. The webhook must be either entity annotation or for broadcast in the configuration.

✔️ Checklist

• A changeset describing the change and affected packages. (more info)
• Added or updated documentation
• Tests for new functionality and regression tests for bug fixes
• Screenshots attached (for UI changes)
• All your commits have a Signed-off-by line in the message. (more info)

[backstage-goalie]

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
@backstage/plugin-notifications-backend-module-email	plugins/notifications-backend-module-email	patch	v0.1.0
@backstage/plugin-notifications-backend-module-teams	plugins/notifications-backend-module-teams	patch	v0.0.0
@backstage/plugin-notifications-node	plugins/notifications-node	patch	v0.2.0

[github-actions]

Uffizzi Ephemeral Environment - Virtual Cluster

Your cluster pr-24599 was successfully created. Learn more about Uffizzi virtual clusters
To connect to this cluster, follow these steps:

1. Download and install the Uffizzi CLI from https://docs.uffizzi.com/install
2. Login to Uffizzi, then select the backstage account and project:

uffizzi login

Select an account: 
  ‣ backstage
    jdoe

Select a project or create a new project: 
  ‣ backstage-6783521

3. Update your kubeconfig: uffizzi cluster update-kubeconfig pr-24599 --kubeconfig=[PATH_TO_KUBECONFIG]
   After updating your kubeconfig, you can manage your cluster with kubectl, kustomize, helm, and other tools that use kubeconfig files: kubectl get namespace --kubeconfig [PATH_TO_KUBECONFIG]

Access the backstage endpoint at https://backstage-default-pr-24599-c5372.uclusters.app.uffizzi.com

[drodil]

The absolute link utility is the same as here #24555 which needs refactoring once this is merged.

[github-actions]

This PR has been automatically marked as stale because it has not had recent activity from the author. It will be closed if no further activity occurs. If the PR was closed and you want it re-opened, let us know and we'll re-open the PR so that you can continue the contribution!

[drodil]

Not stale, @mareklibra chance to review?

[mareklibra]

I haven't run it but code-wise it lgtm.

[drodil]

Rebased

[github-actions]

This PR has been automatically marked as stale because it has not had recent activity from the author. It will be closed if no further activity occurs. If the PR was closed and you want it re-opened, let us know and we'll re-open the PR so that you can continue the contribution!

[drodil]

Not stale

[mareklibra]

@drodil Let's merge it when the Ci is green.

[drodil]

@mareklibra we are green!

[mareklibra]

The yarn.lock change prevents me to do the merge, we need backstage/maintainers here. Cc @freben