Azure DevOps - Removed Deprecated Code

[awanlin]

Hey, I just made a Pull Request!

Removed support for what is known as the legacy backend, please use the New Backend System. Also removed the long deprecated azureDevOps.token configuration option, use integrations.azure instead.

✔️ 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]

Missing Changesets

The following package(s) are changed by this PR but do not have a changeset:

• @backstage-community/plugin-catalog-backend-module-azure-devops-annotator-processor

See CONTRIBUTING.md for more information about how to add changesets.

Changed Packages

Package Name	Package Path	Changeset Bump	Current Version
backend	workspaces/azure-devops/packages/backend	none	v0.0.12
@backstage-community/plugin-azure-devops-backend	workspaces/azure-devops/plugins/azure-devops-backend	minor	v0.7.3
@backstage-community/plugin-catalog-backend-module-azure-devops-annotator-processor	workspaces/azure-devops/plugins/catalog-backend-module-azure-devops-annotator-processor	none	v0.1.2
@backstage-community/plugin-scaffolder-backend-module-azure-devops	workspaces/azure-devops/plugins/scaffolder-backend-module-azure-devops	patch	v0.1.1